Of course everyone wants absolute road safety, but too often it seems that these laudable aims have been replaced with a desire to extract as much money as possible out of motorists or to make driving so unpleasant as to force motorists into feeling like second class citizens, intensely disliked but - for reasons of financial and political expediency - tolerated.
So whilst most of this site looks at public transport options which will improve road safety by reducing the total amount of road traffic
these pages promote positive solutions to improving road safety which do not rely on the
nefarious principles of entrapment, extracting money from motorists' wallets or awarding them as many license (penalty) points as possible.
Also looked at are other topical issues where sadly money grabbing also appears to have replaced sensible traffic management.
Direct links to other pages within the theme...
|'Signs Of The Times' - along with signs advising vehicle drivers of speed cameras (etc.,) road signs such as these are all too common in Britain of the mid2000's.
If 'Narrow' Roads Cause Congestion
Early morning rush hour traffic on the (road name unknown) in Toronto, Canada.
In Britain we do not have any roads as wide as this (13 lanes in total) - although parts of the M25 London Orbital Motorway have recently been widened to almost this size - and we can be assured that within just a few years of opening in this format the sections involved will start to experience congestion - yet again!
Apart from road works and accidents the principal cause of traffic congestion is too much traffic trying to use not enough road space.
In the past a combination of road widening and building new roads were seen as the solution to traffic congestion. But now experience has shown that usually this will only provide short-term relief before the extra road space has attracted so much extra traffic that the roads become as congested as before. To accommodate all this new traffic the logical next step would be to build / widen yet more roads -- but that would simply be starting the whole crazy cycle yet again!
Many people now agree that if we cannot build ourselves out of trouble then the only equitable and sustainable way we will reduce the amount of traffic using the roads will be by improving the alternatives (ie: public transport) and adopting land use policies which reduce the need for travel. To avoid duplication these subjects are more fully covered on the Enough Stick, How About Some Carrot page.
Variable Speed Limits.
Variable speed control as used on the west and south-west sections of the M25.
In an attempt to squeeze extra traffic onto already congested roads some of our busiest motorways have variable speed limits whereby the speed limit is automatically reduced whenever the road starts to become congested. The limits are enforced by speed-trap cameras located above each lane on the overhead gantries.
After a few years experience research has shown that this system smooths out the traffic flow (by reducing the stop - start phenomena) and reduces the number of vehicle shunts which used to happen when fast moving traffic would 'hit' a 'wall' of stationary traffic. However it does this at a price of slowing down the overall traffic speed by as much as 10%. This might be because it is an automated system and the criteria has been set too sensitively, so it switches on too soon / when it ought not to.
As of spring / summer 2008 the film-based cameras which enforce these speed limits are being replaced with digital cameras. As this will make it significantly easier to detect vehicles travelling above the limits and process prosecutions, so the thresholds at which the cameras are 'triggered' are also being reduced to the 'normal' threshold of 10% + 2mph (ie: 79mph for a 70mph limit). Since the cameras are active 24/7 (ie: even when the variably reduced speeds are not in force) so this means that even vehicles safely travelling at what many people consider to be the 'normal' and 'reasonable' motorway speed of 80mph will find themselves being caught out. It must also be remembered that insurance companies normally sting people with speeding convictions by demanding higher premiums.Click the cashtill or speakers icon to hear the cashtill ring up a sale. (This link leads to an 8kb file called "cashtill.mp3").
Combined Variable Speed Limit and Speed Camera sign on the western section of the M25 near to Heathrow Airport. The larger version of this image more clearly shows how the variable speed limit ends for traffic leaving the M25.
|As this image shows, some sections of the M25 have already been widened from three to four lanes - hence the gap in the hard shoulder under the bridge.||Evening peak-hour traffic congestion near the M25 / M4 Junction in West London. Note how that even with four lanes and variable speed limit set at 50 mph congestion still occurs.
It is often suggested (in jest) that what the M25 needs are not speed cameras but "pay and display" machines as used at car parks!
There are also some places where congestion is a direct result of the road authorities.
|Traffic congestion on the M11 motorway which is directly attributable to traffic mis-management policies forcing two lanes of traffic to merge into one.||This image was sent in by someone, and although the logo suggests it is in jest it points to a reality which all too often is exactly how things are.|
The view (above left) of the M11 motorway entry slip road at Redbridge shows evening peak - hour congestion that is directly attributable to traffic mis-management policies which saw the entry slip road being reduced in width. Often the traffic is so heavy that the congestion starts at around 3pm - and lasts until after 7.30pm.
Amazingly this road space reduction was carried out in conjunction with the opening of a new 3-lane road which leads into it - the A406 Barking to South Woodford extension of London's North Circular Road. Not shown are the feeble road signs (similar to the sign seen at the top of this page) installed to warn of 'possible queues ahead' .
In this location the solution would be to modify the road lane markings at the junction where the slip road joins the main carriageway and then re-open the closed lane.
Perhaps a mandatory part of the traffic planners employment (ie: the people made the crazy decision to reduce the road's capacity) should be to be forced to endure the consequences of their actions. Preferably every Friday evening at 6.30pm when they would rather be home 'sooner' rather than 'later'. Especially on rainy winters' evenings, when the traffic is at its slowest, and always outside of their working time - so that it only inconveniences them (and not their employer), as this will help them to truly appreciate just how much their well (sic) thought out decisions negatively impinge upon the unfortunate victims (ie: homeward-bound travellers).
As an aside, this section dates from the early days of this website (in 2000) and some years later the road space reduction on this entry slip was reversed with (where this slip road joins the main carriageway) the road markings being modified to reinstate the closed lane. However, this much needed re-adjustment was accomplished in conjunction with traffic (mis-)management policies which disbenefitted all off-peak road users by way of a 30% reduction in the speed limit. (70mph down to 50mph)
An example of a road layout at a traffic signaled junction being modified in a way which actively reduces road space.
Whilst many people will welcome making life for pedestrians easier, it is very hard to know how removing a road lane (as seen above right) and extending the footpath all of a couple of yards makes such a difference as to be worthwhile. What it does do is tick some boxes in a smug self-centred anti-traffic transport planners' design manual which details how to use making life better for pedestrains as a nefarious trick to make life significantly worse for anyone who has the temerity to wish to travel by motorised transport - which includes by bus.
The Curse Of The Hole In The Road!
Whilst everyone understands that roads sometimes need digging up to access the utility services below them (gas, water, electricity, telephone, sewage, etc) it often seems that irrespective of what the utility companies say about minimising the inevitable resulting disruption their works frequently take a seeming eternity to complete, in the process holding innocent luckless travellers just trying to get from A to B as hostages to misfortune. The way they reduce traffic flows (in the process increasing congestion) by leaving lanes closed even when no-one is working - especially at [traffic signalled] junctions and on the approach to roundabouts - only serves to give the impression of salt being rubbed into wounds.
Road works can be found just about anywhere, but these images mostly focus on road works at traffic signal controlled junctions - where they tend to reduce road capacity in ways which make already difficult situations even worse - and locations where there are temporary traffic signals.
|Examples of road works closing lanes at traffic signals - guaranteed to create havoc!|
|In addition to closing a lane in this direction these works closed two lanes (one of which was the sole lane for right-turning traffic) in the opposite direction. The lane closure also extended through further
traffic signals (not seen here) and right up to a roundabout entry slip road.
Delays in excess of 20 minutes were typical, although many car drivers (travelling in this direction) found solace in the use of nearby residential roads - an option not available for buses or goods vehicles.
Woe betide anyone depending (with their life) on the swift arrival of an ambulance or fire engine using this route.
|This lane closure resulted in traffic trying to turn left from the turning in the foreground often having to wait for numerous signal cycles to pass before (a car at a time) being able to
exit from the side turning.
These images all show what could be said to be the causes of a terrible waste of fuel, as well as sources of significant air pollution.
Even if vehicle drivers constantly switch their engines off whilst stationary the constant stop start / on off would mean that much wastage would still be occurring.
|These works resulted in the temporary closure of a traffic signal controlled right-turn lane - but whilst holes were dug in the road none of these were along sections of road used by traffic turning right!
Instead the space was used as a storage area, although by the time these images were taken most of what was being stored there had already been moved / buried underground. But it was not just road users who were
suffering... this works forced a bus route which serves local residential areas to be diverted away, so many bus passengers endured many weeks with a complete of loss of their service.
Since none of the holes were dug in ways which would have actively blocked right-turning traffic it has to be asked whether the road and bus users were being unnecessarily inconvenienced?
|These works in the Stratford area of London were related to road junction changes in connection with the building of the 2012 Olympic Games site.
Short of completely closing the road the works could not have been managed in a way which causes worse delay and suffering... not only are 3 lanes of traffic reduced to a single lane but the constriction extends through a busy traffic signalled junction (not seen here), helping to minimise traffic flows and thereby maximise delays. As a bus passenger at the time it was quicker to walk!
... and then there are temporary traffic signals...
|At this junction the traffic flow was reduced from alternate cross flows to each of the four individual traffic flows having their own turn. The result of this was variable, and even outside the rush hours
some traffic flows endured 20+ minute delays.
When photographing here (during a lunchbreak) a passing schoolboy who was walking home pointed out that in the morning the delays on his bus journey had made him 30 minutes late for school, so he was walking home for lunch as although he would be late back afterwards it would still be quicker than travelling on the bus.
Note that in the image above left the red arrowhead is pointing towards the temporary traffic signal, which was showing green. The parked cars on the right of the image (near the bus stop) were in 'pay & display' places and not delaying traffic flow.
What made these works even more severe than they might otherwise have been is that at the same time the alternative route (a 3 lane dual carriageway) was also experiencing traffic chaos as a result of road works.
|The temporary traffic signals at these road works were either badly set-up or not working properly; either way this bus and all the road traffic behind it spent over 5 (five) minutes waiting for them to change! In the meantime the traffic flowing in the opposite direction can be best described as 'zero'.|
Another solution for trying to maximise people (and not vehicle) throughput over limited road space are High Occupancy Vehicle (HOV) Lanes.
The concept is similar to a bus-only lane, except that private cars carrying two or more people are also admitted. (Different HOV schemes on different roads may vary the minimum 'people' number).
The logic behind HOV lanes is that sole occupancy cars take up the most road space. So, in addition to trying to reduce traffic congestion by encouraging car drivers to switch to public transport (buses, etc.,) HOV's help to provide a solution by encouraging people who drive to travel with others.
The introduction of HOV lanes in Britain led to the creation of several car sharing schemes, which aim to match motorists with passengers, and it seems that as long as only minimal fuel expenses change hands (ie: there is no profit motive) then the tax authorities will look kindly upon the financial aspects of car sharing.
However, as ever, there will always be "winners and losers" and some members of the community (commercial travellers on company business, trades people eg: plumbers, midwives, etc.,) usually have to travel alone so despite needing to be able to use the roads for their employment they are unable to directly benefit from HOV systems. As the sign in the image panel (left) suggests, heavy goods vehicles also lose out, as they are banned no matter however many the occupants, as apparently they could interfere with the optimum working of the HOV lane. It could be however that some HOV schemes will allow HGV's with two or more people, aboard - it will depend on the location and traffic profile of the roads involved.
The first British HOV schemes were in Leeds and the South Gloucestershire / North Somerset area. Leeds was first, with their system opening on 11th May 1998.
In December 2004 it was announced that 'flagship' a HOV scheme would be trialed on the M1 motorway between junctions 7 and 10 (Milton Keynes South to St Albans) with the idea being that if it proved successful then it would be extended further north when more sections of the motorway are widened (as well as rolled out on to other motorways too). However this was scrapped in March 2008 after a feasibility study decided that it "could lead to an increase in accidents". This is because it was proposed to use the outside lanes, and (suddenly!) someone had recognised potential hazards in that vehicles on other lanes could be "undertaking" others in the outside lane (passing on the inside is illegal - although poor lane discipline by 'middle lane hoggers' means that it frequently happens anyway) and over concerns about how the police would be able to pull over non-compliant vehicles. It also pointed out that there was no reliable camera system for checking the number of occupants in vehicles - although that might not be exactly so (see below).
In Leeds the HOV scheme applies to inbound traffic only, utilising the existing nearside lane of the dual carriageway of the A647 Stanningley Road. To accommodate 3 side roads and a parade of shops, the HOV lane is in 2 sections (0.4km and 1.1km) over 2km of highway.
One of the attractions of the HOV system is that no special formalities are required to benefit. Unlike toll road schemes, HOV does not require advance registration, the carrying of "spy in the cab" RFID tags on vehicles, etc - although the British government is understood to be looking at forcibly implementing this anyway, as part of a scheme to keep track of all vehicle movements nationwide. (Every road vehicle will have a RFID chip embedded in one of the number plates, with roadside readers interrogating them as vehicles pass.)
Outside of Britain HOV lanes are a well proven concept in North America (where they are often called carpool lanes, commuter lanes or diamond lanes - the latter because of the diamond shaped road marking which is used to delineate them) and Australia, plus some exist in Europe too. Apparently one scheme in Madrid, Spain found that so many vehicles met the 2+ specification that to make the system work they had to change to 3+.
One of the biggest obstacles to HOV lanes comes from enforcement, which has to be undertaken by police officers, who have many other duties too. The tricks and dodges which North American car drivers will use to try and get around the HOV regulations are legendary. These include the use of blow-up dolls and dummies (which often are little more than foam heads on broomsticks) to make it look as if there are some passengers(s) when in fact none are being carried for the carrying of hitch-hikers (or students), who will charge a small fee for travelling in the vehicle with the solo driver and helping them to legitimately meet the carpool lane occupancy regulations.
It is questionable whether HOV lanes really are a long-term solution - or just another short term "fudge" aimed at temporarily improving traffic flows. The (British) Department for Transport (DfT) suggest that increasing car occupancy rates could reduce the numbers of cars on the road by 5% and, thus, significantly cut congestion. But a Leeds traffic survey conducted in May/June 1999 found that after just 2 years traffic flows on the A647 had returned to 1997 levels, although there was also evidence of an increase in scheduled bus services and people travelling by motorcycle and pedal cycle. It might be significant to note that in the same time period the economy of Leeds City centre has been booming, so this too would account for increases in all modes of transport.
However experience in Leeds has shown some success in reducing sole occupancy of road vehicles. The average car occupancy rate for Leeds is 1.3 persons per car and the commencement level for the A647 in May 1997 was 1.35. By September 1998, surveys showed that this had increased to 1.41 persons per car, mostly by traffic transfers. By June 1999, A647 car occupancy had reached 1.43.
On the A647 specifically, HOVs have increased by 55 vehicles (5%) over the 3 hour morning peak. The figures also show a higher proportion of HOVs are now travelling in the morning peak hour (an additional 105), perhaps because this is their preferred time and their journey is more predictable. There have also been small increases in 3, 4, and 5+ occupancy vehicles.
Journey times have improved too, with time savings for the 5km trip from the Leeds Outer Ring Road to the Inner Ring Road initially being in the order of 2.5 minutes, but after some "tweaking" of traffic signals this improved to nearer 4 minutes. In 1998 bus operator FirstGroup reported that their standard scheduled services were showing time gains of 3.5 minutes.
Additional information from various Internet sites, especially a 755kb Adobe Acrobat "pdf" file which contains further information and illustrations but does not identify its creators, which is a shame - as this means that they cannot be credited. The file can be downloaded from this web site by clicking here. (document will open in a new window.)
It is not the aim of this webpage to keep a tally of the large number of HOV lanes which are now being introduced around Britain.
In summer 2005 it was reported that an automated camera detection system was under development - amongst the challenges which needed to be resolved were to correctly detect occupants in vehicles with partially obscured windows / passengers only in the back seats / vehicles with children in them / babies in child seats... plus of course that no-one is using blow-up dolls or dummies - these being the legendary North American 'dodges'!
In late 2007 a new infrared CCTV system was unveiled which can count the number of people in a vehicle - and differentiate from dolls, dummies, or whatever - by detecting human skin and counting faces.
Known as Dtect, this system uses cameras which are elevated so they have a three-quarter vantage point of vehicles on the road and are therefore able to get a clearer view inside a vehicle - which includes taking images through a vehicles' windscreen.
At present the promotional buzz words and catchphrases include that it would allow the police and authorities to monitor how many people are in the car accurately while not infringing people's right to privacy. Some media reports have talked of the possibility of a legal challenge on the basis that the use of Dtect cameras amount to illegal surveillance, although it is probably too late for that, especially in a country where CCTV camera systems are virtually already on every street corner.
One possible future use being touted for Dtect camera systems is that they could be also used to police sophisticated local congestion and road pricing schemes in which discounts could be offered to anyone willing to share a vehicle.
Is everyone happy about this??? After all, it does sound logical. Maybe we should all just welcome implantable RFID chips and let the power mongers turn us into real life 'Borg', who are monitored and controlled 24/7 - this seeming to be the ultimate endgame plan...
Road Pricing is more fully explored on the Road User Tolling and Congestion Charging page.
A few simple ideas that would reduce the death toll caused by accidents. In no way is this list meant to be exhaustive.
Some of these suggestions may require legislation.
This list was mostly written in the early days of this website (around 2000), since when some of these ideas have began to be realised.
Don't get so close to me...
Especially on faster roads a significant source of danger comes from vehicles which are travelling too closely... and then when the driver of the front vehicle brakes sharply (or has a tyre blowout, swerves to avoid an obstruction in the road, or something else happens) there is insufficient time for the driver of the next vehicle to safely react and reduce their speed (enough) before the vehicles collide.
In the absence of radar and other on-vehicle electronic systems which inform vehicle drivers when they are too close to the vehicle in front the early 1990's saw some experimental road markings which encourage vehicle drivers to keep a safe distance from the vehicle in front being tested on several British motorways. Located 40 metres apart the idea was to encourage vehicles to avoid shunt accidents by keeping two chevrons apart, which at 70mph equates to the 2 second minimum time period recommended in the Highway Code.
Research showed that these road markings helped reduce accidents by as much as 56%, with multi-vehicle high speed shunts down by 42% and single vehicle swerved to avoid other traffic accidents down by 89%. Furthermore, the keep your distance effect could be detected up to 11 miles beyond the end of these markings.
Before these markings were installed 1 in 5 vehicles were found to be travelling too close; this experiment reduced the figures to 1 in 7.
With the experiment having been proven worthwhile this style of chevron markings have been installed on various motorways and other higher speed major roads around Britain.
Perhaps the greatest deterrent to the success of this safety measure would be that while some drivers will try to keep a safe distance from the vehicle in front other drivers, on seeing what to them looks like a large gap, will fill it.
This unusual looking traffic signal is actually demonstrating a clever way of inducing safer driving on the approach to a traffic signal controlled junction.
Ordinary traffic signals enhance road safety by controlling the flow of vehicles and pedestrians where they intersect, but often they also cause accidents when the green phase ends and drivers of approaching vehicles have to make a split second decision whether to brake harshly (and hope that the vehicle behind is also stopping, and will do so without crashing into them) or slam on the accelerator and hope to get past the traffic signals before they change to red.
Road safety experts often warn of the dangers of harsh braking as it can lead to a vehicle skidding and the driver losing control (especially in inclement weather), as well as creating extra wear and tear which can be detrimental to the vehicle.
Utopians often suggest that when approaching traffic signals motorists should always expect to have to stop, but in the real world the last thing a motorist travelling at 65-70mph should be expected to do is slam on the brakes for what effectively becomes an emergency stop - especially if the traffic signals are equipped with 'red light' cameras.
The danger is greatest on roads with higher speed limits, but in the Düsseldorf street shown here the speed limit is 50km/h (about 30mph).
As demonstrated in the (speeded up) animation, first the numbered spectacles illuminate advising motorists of the speed at which they need to drive to 'catch' the green light, (slower at first, faster later) and then when it will no longer be possible to reach the traffic signals while they are showing a green phase the lower two amber spectacles will flash alternately advising motorists to be prepared to stop. The amber lights stop flashing when the traffic signals have changed to red.
The Spanish seem to have found an equitable way to slow speeding traffic down in their villages.
All they do is link traffic signals to vehicle speed sensors - and arrange the signals to function so that vehicles which are travelling through a small village more quickly than the speed limit are forced to stop at the traffic signals.
Whilst this could work here in Britain too it quite possibly would result in a drop in takings for the Speed Camera Partnerships. Of course if (as they say) safety is their primary objective then this will not be a problem..
No-one likes waiting zombie-like at traffic signals until their turn is reached in the sequence.
It is frustrating.
Even if the wait is only for a minute it can seem to be interminable, with this time-theft leaving people feeling blue.
Indeed when this sort of delay occurs 'time and time again' within the same journey, in the process significantly extending the overall journey time, the cumulative delays have the potential to make motorists red with anger (aka: suffer from a bout of road rage) which can also result in them entering into an emotional state known as a 'black mood', when they will (potentially) cease to be rational beings and instead become like a person who is drunk (or drugged etc.,) and unwittingly do things that are dangerous both to other road users and their own long term health. (The term "black mood" is so-named because when in this condition people really do feel as black as night, and despite being an emotional state it can have real physical effects on the human body, as well as cloud rational thought processes).
Motor vehicles sitting at traffic signals are also a significant source of air pollution. Cars, motorbuses, lorries, etc.
In inclement weather pedestrians can also find having to wait (for the "green man" or "green hand", etc) whilst getting a soaking to be most unpleasant - and to be a good reason for choosing to "travel by car" on their next journey.
It is not surprising therefore that (especially in Britain) most pedestrians waiting to cross roads at designated road crossing points (traffic signal controlled pedestrian crossings, road junctions, etc.,) will cross as soon as there is a gap in the traffic flow. In Britain this is not illegal, although there are some countries where it is a criminal offence to use one's eyes to look at the traffic flow and cross if there is no approaching traffic & it is safe to do so - instead the pedestrians MUST wait for the "green man" (eg: Germany).
In many overseas countries it is also usual policy that at night the traffic signals at some road junctions are switched to flashing green or amber ("give way") as it is seen to be pointless to require road users to sit zombie-like for minutes on end (at red lights) when there is simply no other traffic in the vicinity.
In some places (eg: many States in the USA) it is permitted for road users to pass a red stop signal when turning right (remember they drive on the right) - except where there is a road sign banning this.
A variant which could be used here in Britain too would be to indicate the specific junctions where this is permitted - the example seen here (below left) comes from Dresden in the former East Germany.
|This image comes from Dresden in the former East Germany, the fixed green arrow next to the red stop lamp tells motorists that it is permitted to turn right on red lights.||To make it easier for road users (including cyclists) to see when the traffic signals change to green the French locate repeater lights half way up the pole.|
|Most British drivers will know what the grey device seen here is for... and whilst slightly longer amber phases and advance warning that the lights are about to change would also help improve road safety (as seen in the section above) the reality is that a small minority of vehicle drivers DO blatantly ignore the rules of the road - spreading danger to all other road users and pedestrians alike.||To try and reduce the frustration as well as discourage the jumping of red lights some countries use countdown timers to inform road users of how long it will be before
the signals change in their favour. Sometimes the timers also advise motorists of how much time is left before the green phase ends.
This image comes from Manilla (Phillippines); picture by Gary X sourced from the Subways and Urban Transport group of forums on www.skyscrapercity.com (link to an external site which opens in a new window).
Vehicles jumping level crossings is such a serious problem that at some locations Network Rail has had to install traffic signal style "red light" camera systems. Many road users would however question why such a long delay is required between the level crossing being activated and the arrival of the train.
Traffic signals apply to ALL road users - whether they are on 2 wheels - or 14! Unfortunately many pedal cyclists treat them with contempt and just cycle through - often forcing pedestrians who are crossing the road to scatter (flee) for their lives. Yet pedal cyclists have a unique safe and legal alternative option in that they can dismount and walk!
|Road users jumping "stop" signals are also a source of danger for the railways too - yet, curiously even though they are innocent victims the railways
are often seen to be the villains. In New South Wales, Australia they even made their High Speed Trains slow down because too many road vehicle drivers were causing accidents
at level crossings.
This level crossing is next to Acton Central station on the North London Line.
|As this image suggests, pedal cyclists can avoid the frustration of sitting at red lights by dismounting and W-A-L-K-I-N-G!
This image is a video-still - a short clip of the video from which it was sourced has been placed on the 'youtube' file-sharing website and can be watched (in a new window) by clicking the image, projector icon or here - http://www.youtube.com/watch?v=zyWXWZYrmJA.
In addition to showing the cyclist who is waiting at the traffic signals and the cyclist who is walking the bike on the footpath the video also shows that the partially obscured cyclist seen just in front of the yellow box front took advantage of the pedestrian phase in the traffic signals to turn right.
Traffic signals dedicated to cyclists are less usual here in Britain - especially in older towns and cities where lack of road space means that the cyclists are rarely provided with dedicated cycle lanes which are physically separate from the other road traffic. As the image below left suggests, sometimes even where these facilities do exist one wonders why anybody bothered!
More commonly found (in older towns and cities) are advance waiting areas. These encourage cyclists to go to the front when waiting for traffic signals to change.
In the two images below the special cyclist symbols on the traffic signal heads are more easily seen in the clickable larger versions.
|Maybe there is a reason why this dedicated cycle lane has been blocked off with a barrier with 'diversion' sign on. However, since the diversion is to a lane where there is a compulsory left turn so it is unlikely that it will be heeded. This example is seen in the Clerkenwell area of London.||Advance waiting area (in front of the main traffic lanes) and a dedicated cycle lane.
Locating them both at the same traffic signals could be seen as 'going over the top', but it makes for an interesting contrast in cyclist facilities at traffic signals.
|The Dutch are very proactive in providing extra facilities for pedal cyclists, and in addition to special traffic lanes and off-road cycleways this often also includes dedicated traffic signals - such as seen here in the city of Arnhem.||In an attempt to encourage cyclists to obey the traffic signals some Dutch cyclist signals also include count-down timers advising how soon it will be before the lights change and it becomes safe to cycle through the junction. This example was seen in Amsterdam.|
|These pictures come from San Francisco and show pedestrian countdown information as used at road crossings.
Above left: You may start to cross the road.
Above right: If the hand is flashing (and showing a time), continue to cross the road but if you are on the footpath then do not start to cross the road (or cross at your own risk!!!). If the hand is solid, and no time is shown, remain on the footpath.
Pictures sourced from promotional material issued by the San Francisco Department of Public Health. www.dph.sf.ca.us/traffic_safety/general_information.htm (link used to lead to the relevant webpage but has been deactivated as the page has either been renamed or removed).
Countdown information advising pedestrians in Dublin, Eire, how soon it will be before the signals change in their favour.
Footbridges and underpasses offer safer ways for pedestrians - and cyclists who walk their bikes - to cross busy multi-laned roads, although not everyone looks upon them favourably.
|The footbridge seen here provides pedestrians with a safe way to cross a very busy section of London's North Circular Road. As part of a traffic (mis)management policy in the
early 2000's the then Mayor of London and his traffic planners submitted proposals to replace it with a surface foot crossing. This was (still is) very much something that the local community
objected to, as the footbridge was (still is) seen as being a significant safety aid, especially for when unaccompanied children cross the road. Concerns also extended to potential dangers (to
everyone) at the admittedly few times when the traffic signals fail, plus that the addition of pedestrian phases to signals at an already extremely busy junction which at busy times already fails
to cope with existing traffic flows would only have served to make a bad situation even worse. After much local campaigning the future of the footbridge looks safe.
The sign should say "pedestrians use footbridge" but some of the letters have fallen off.
|This central London road features what is known as a 'bus gate' where traffic signals are used to regulate the flow of traffic with the buses and taxis being able to use a lane where the 'green' phase is longer (and illuminates before) the signals for the general traffic.||Even buses sometimes find that delays at traffic signals can be a nuisance, with (wherever possible) their drivers seeking alternative options. This bus is by-passing transponder operated traffic signals on a bus lane which maybe beneficial when the roads are busy, but because of the delay waiting for the lights to change can also be detrimental at other times.|
|These Italian signals are actually working correctly! Italy is one of the countries where for many years traffic signals changing from green to red would show green + amber and although at the EU's behest they are now changing to amber (on its own) these signals were still operating under the older system. Another operating quirk is that the red lights remained illuminated at all times - with the green arrows also lighting-up at the appropriate times, as required. This would be a way of specifying that only traffic travelling in accordance with the direction shown by the illuminated green arrow may proceed past the stop line.||Whilst giving all the different modes of transport their own dedicated phases at traffic signals may sound utopian the reality is that it can result in horrendous delays to everyone trying to pass through the junction. This example was seen in Geneva, Switzerland - and features separate lights for cyclists, trams, buses, taxis, 'the general traffic' and pedestrians.|
As stated above, in many areas (in Britain) it has now become de facto policy to use traffic signals as an additional way of slowing the traffic down and generally making life less pleasant for anyone who has the temerity to want to travel by road. In this respect bus & tram drivers / passengers suffer along with all other road users - except cyclists who usually just ignore the red lights.
Although transport planners and (local) politicians will disagree the reality is that it seems to have become policy to install traffic signals with free abandon, with all but the most minor of road junctions and designated pedestrian road crossings being signalised, irrespective of real need or benefit.
This explains why in cities such as London even night-time journeys when the roads are largely congestion - free take so much longer than they did 30 years ago - with the increase in journey time solely due to the significantly increased time spent (wasted) sitting zombie-like at red lights. It would seem that despite their fine words the traffic planners & politicians simply do not care that the more vehicles keep stopping, idling and then starting so the more the air pollution which is created within our urban areas.
Reasons why this situation has arisen are multifold. In some locations it will be because positions of power were reached by politically motivated people who dislike traffic (which can be a byword for people who travel by car) having the freedom to make rapid progress because it means that they (the car drivers & their passengers) will then travel more quickly than public transport, especially buses. Some reports suggest that the Treasury (ie: the governmental organisation which looks after the nation's finances) supported actions which cause road vehicles to keep stopping, as constantly stopping and starting / pulling away from rest increases a vehicles fuel consumption - and therefore the taxable income will rise.
The actions of ludditte anti-traffic lobby groups must also be factored in too. Often these are single issue non-motoring pressure groups comprising of a comparatively tiny number of people which will use any excuse (such as a possibility of an improvement in safety) as lobbying tools to push forward their agendas. Typically these agendas include hoodwinking transport planners (including traffic signal engineers) and receptive politicians to create traffic (mis)management systems as part of a policy of making driving unpleasant. As if that was not enough, because their bidding is done by local governments it is our money that is used to no beneficial effect or to bad effect.
Many of these lobby groups actively want to see people switching from cars to buses, and totally fail to recognise that when considering air pollution and the need to reduce it because it is harming our health so fossil fuel powered motor buses must be included along with cars and lorries in the list of polluters / the vehicles which are 'part of the problem'. Indeed, unless a motor bus is fairly full the total amount of pollution on a 'per passenger' basis is almost certain to exceed amount of pollution which would result if the passengers switched to a few petrol engined cars. The lobby groups also fail to understand that motor buses are generally seen to be at the bottom of the list of modal choices.... Whilst there are problems in urban areas with traffic congestion a part of the solution would to change the present system of deregulation to encourage more (& more frequent) off-peak services, as at present there are people who would like to travel by public transport but drive simply for want of a viable alternative.
It has to be remembered that people cherish having the freedom to choose how to travel, and also cherish that for the first time in recorded human history we have access to mechanical transports which enhance our lives by allowing us to compress time and reach destinations far more quickly than if we had walked there. Plus people cherish having the freedom to reach remote places that often are not served by public transport at all. And all this is at times which we choose / are convenient to us!
When Penguins Are Good Whilst Puffins & Toucans
A Little History.
Pedestrians have the right of way at Zebra Crossings, as once on the roadway the law requires that the road traffic must give way to them (unless directed otherwise by a police constable or other authorised person). Zebra crossings are often the site of conflict between pedestrians and road traffic because sometimes pedestrians put themselves in harms way by assuming that their right of way means that even approaching vehicles which are very close to the crossing will be able to safely stop in time (and that any vehicles behind them can too) and therefore they walk out into the road without either looking properly or waiting on the kerb for the traffic to stop. It may be that the vehicle driver will still be blamed for the ensuing collision but is it still not better to wait a few seconds and avoid being hit by a moving vehicle? At busy locations conflict also comes because the near continual stream of pedestrians crossing the road effectively blocks the road, causing traffic congestion. In the most severe instances this has been known to have to be resolved by police constables or traffic wardens controlling the crossing, telling pedestrians when they may cross the road and also telling road users when they should not stop at the crossing.
Zebra crossings are supposed to have the Belisha Beacon poles on the same side of the crossing as the approaching traffic. This means that on normal two-way roads they will be on the pedestrians' right, whereas on one-way streets and dual carriageways the locating of both poles on the side of approaching traffic means that sometimes the pole will be on the pedestrians' left.
Zebra crossings are normally only used on roads with a low speed limit, which typically would mean 30mph (or less) although they might be found on roads with a 40mph speed limit at locations where vehicles would be expected to be travelling relatively slowly. This is for safety reasons to reduce the chances of accidents where pedestrians walk out in the face of oncoming traffic which is not speeding but still travelling too fast to stop.
Clicking any of these Zebra crossing images will lead to a dedicated page showing more (and larger) images in a popup window; alternatively clicking here will open the page in a new full-size window.
Because of the conflicts described above the early 1960's saw trials with modified types of crossings where the pedestrians would need to press a button to activate signals which would stop the traffic for them. The first type of these crossings were known as Panda crossings. Panda crossings featured a distinctive black & white triangular design painted road surface plus traditional black and white striped poles equipped with pedestrian call button units, a 'wait' indication which would illuminate when the button had been pressed, and traffic signals above which was a Belisha Beacon with horizontal black stripes. To avoid legal issues pertaining to pedestrians still having the right of way Panda crossings only had indications telling pedestrians when they may cross, and not when they may not cross.
A Little More History.
The light sequencing used for Panda crossings comprised of a logical but ultimately confusing combination of pulsating and flashing amber and red aspects advising road users when to stop and when they may continue if safe to do so, plus for the pedestrians an illuminated 'wait' indication that was located on the Belisha Beacon pole (near to the push button) which when it was time to cross was extinguished in favour of a flashing white coloured word 'CROSS' (located on the traffic signal head on the other side of the road) which speeded up its rate of flashing as time shortened. When not activated all the lights would remain off. There was also a measured pause period between crossings which was designed to help keep traffic flowing.
Right from their introduction these crossings were seen in an unfavourable light, with one of the first people to use one of the new crossings after its inauguration describing them as being 'hairbrained'. For many reasons including electro-mechanical problems and the fact that a different format to normal traffic signals was used and causing confusion the second half of the 1960's saw all the Panda crossings being replaced by another experimental design of crossing.
Controlled Crossing Area - Where It Was Illegal To Cross A Road. Also in the early 1960's there were trials at three locations where, for the first time, it became a punishable offence for pedestrians to cross a road anywhere except at a designated crossing place at a designated time. The significance of this is that there is an ancient rule of the road which says that no particular road user has a priority over any other user, and therefore despite some signals already doing this it was not legally allowed to tell people who travel by foot to give precedence to people who travel in motor vehicles.
The reasoning behind this experiment was the growing number of pedestrians trying to cross roads by just walking out in front of moving traffic and in the process getting themselves killed or injured. It should be bourne in mind that this was an era when the introduction of the motorways had proven that it was possible to segregate higher speed long distance traffic from local traffic, and ban pedestrians from the fast roads, so it was felt that road safety would be enhanced if busy urban streets also saw segregation between pedestrians and the traffic.
The new regime lasted for a period of one year during which between the hours of 7am and 7pm (07.00 & 19.00) it was simply not allowed to cross the thick red lines which had been painted alongside the kerbside edge of the footpath. In addition to special signs (which used a logo of a 'stick' man) at the start and end of the controlled areas there were repeater signs approximately every 40 yards and a dedicated task force of police constables enforcing the regulations and giving out £20 fines to pedestrians who broke the rules. Pedestrian traffic signals were located every hundred yards, for the first time these traffic signals were legally allowed to tell pedestrians when not to cross. This came in the form of a white neon stick man standing still, the same stick man also advised pedestrians when it was safe to cross (he started 'walking') and when the pedestrian phase was ending (he started 'running'!) To minimise traffic congestion the signals worked on a 'green wave' basis, so that traffic would not be stopped at each crossing in succession.
The concept with these crossings was to break the mold from what had been done before, although in many ways they were more evolutionary than revolutionary. For instance, while they did not use the Zebra's and Panda's distinctive painted road markings, they retained the metal studs in the road surface which delineate exactly where pedestrians should cross the road. Another partial change saw the Panda's system of pulsating lights when the crossing was activated being replaced with steady lights, whilst the flashing 'cross now' indication advising pedestrians that they should not start to cross and flashing amber indication which advised road users that they may proceed if it is safe to do so were retained. The new crossings also introduced some innovative new features, including...
In most respects the experimental X-ways were deemed to be successful, and in modified form exist to this day. The primary changes when they switched from 'experimental' to 'production' mode were the replacement of the white X with a normal traffic signal style green lamp, changes in the timing of the lights (so that pedestrians have a longer period of 'green man' before it started to flash) and the return to animal based name. The new crossings were named 'Pelican' crossings. The word 'Pelican' actually means 'Pedestrian Light Controlled', with the 'o' changed to an 'a' so it has the same spelling as the bird. When launched (in 1969) they were promoted as being something brand new, although in reality they were only really modern versions of the traffic-signal style crossings which had existed in some towns and cities since 1929 and which also featured a conventional set of signals for the traffic and a two-light signal for pedestrians. Nowadays Pelican crossings are slowly falling out of favour as transport planners often see several other breeds of crossings as being more desirable.
At many locations Pelican crossings are being replaced with Puffin crossings. As with Pelican crossings their name has a logical sequence of words behind it, this being Pedestrian User-Friendly Intelligent Crossing, albeit with an extra letter 'f' added to correct the spelling. Puffins were designed to act as a logical advancement on Pelicans, incorporating new technologies which were felt to be desirable to improve road and pedestrian friendliness and safety, as well as being more 'inclusive' for people with special needs.
Whereas with the older style of crossings the green & red man symbols which the pedestrians waiting to cross the road need to watch to see when it is safe to do so are situated on the far side of the road - which may not always be easy for people with restricted eyesight to see - so with Puffin crossings these pedestrian lights are located on the same side of the road as the pedestrian, on the same pole as the pushbutton unit, and on the right-hand side of the crossing so that to see them the pedestrians will also be facing oncoming traffic. This is supposed to increase safety by encouraging pedestrians to watch approaching traffic and the pedestrian signal simultaneously. It is also said to reduce intimidation from drivers, which is a somewhat curious comment that probably comes from someone who always waits for approaching traffic to stop, no matter how far away it is, and then fails to understand that by failing to cross when the traffic signal told them to do so they have missed their allocated time-slot - as the traffic signal control unit will have assumed that they did not intend to cross the road and started to change back in favour of the road traffic. At some locations there will be additional poles with ancillary push-button units and indicator lights on the left-hand side of the crossing. On one-way roads and central islands of dual-carriageways the main push button units are still always located on the side from which the traffic is approaching.
Another innovation is that Puffin crossings use overhead infra red / microwave / video imaging detectors and pressure pads to detect pedestrians and traffic flows and control the length of crossing time available to pedestrians, so that people who for whatever reason walk slowly or when large numbers of people are crossing the road so more time is given than compared to the time given to a single person who scurries across hurriedly. This facility replaces the flashing amber / 'green man' phase of the Pelican, during which time road users were allowed to process if the crossing was clear. In addition, in order to reduce delays to the people travelling in road vehicles Puffin crossings use kerbside detectors which detect when a pedestrian has pressed the button on the demand unit to cross, but subsequently either decides not to cross and walks away or finds an opportunity to cross before the green pedestrian phase, in which cases the call for a pedestrian phase is cancelled.
Toucan Crossings. A Toucan Crossing is a speciality crossing which caters for cyclists as well as pedestrians. The choice of name neatly reflects the crossing's intended purpose, this being that 'two-can cross'. The significance of this is that unlike other crossings where the law requires that cyclists dismount and walk across the road (not that they ever do!) at Toucan's the cyclists are allowed to ride across. Sometimes Toucans are extra wide so that independent crossing lanes can be provided for the cyclists and the pedestrians, and sometimes they share the same crossing lane.
Toucans come in either Pelican or Puffin format (ie: with either the pedestrian & cycle lights on the far side of the road or next to the 'call' button on the same side of the road as the pedestrian / cyclist). However, as with Puffins they do not feature the flashing amber / 'green man' phase. At Toucan crossings the red pedestrian and cycle signals are advisory and if it is safe one may cross even when it is red (which of course is what most people already do at all road crossings).
Pegasus Crossings. A Pegasus Crossing is a speciality crossing which caters for equestrians as well as pedestrians. The choice of name neatly reflects the crossing's intended purpose, this being that of Pegasus, the winged horse.
Tiger Crossings. Under current law a pedestrian crossing is just that, ie: for pedestrians. Cyclists are required to dismount (not that many do) and wheel their bikes across. Tiger crossings are modified variants of zebra crossings where cyclists are allowed to ride across. They comprise of yellow and black stripes on the road surface, so they somewhat resemble the stripes on a tiger, which probably helps explains the name. So far it seems that only one Tiger Crossing has ever existed, this being in Aylesbury, Buckinghamshire and around 2005 - 7. It has now been replaced with a Toucan crossing.
Whilst researching the different types of pedestrian crossings some of the information which came up on web searches talked of apparent dangers which it seems are mainly related to the location of the pedestrian signals advising when it is safe to cross, and when road traffic has been given priority.
There seem to be numerous problem areas...
i) The poles with the 'nearside' pedestrian signals are not always being located as intended (aka: 'properly') which makes watching both the signals and approaching traffic less than easy. It could be that sometimes this is because the crossings are located at locations where there is very limited footpath space, or on roads which are curved / have unusual configurations, so the locations of the signals have to be a compromise - for instance, it would not be acceptable to reduce the width of footpath so that a wheelchair could not pass.
ii) The switch of the pedestrian signals from the traditional and well-known farside of the crossing to the nearside is creating confusion, which in the most extreme situations has resulted in pedestrians not being able to find their signals and therefore not even bothering to press the 'call' button - and instead just dodging the moving traffic. Whilst this is not at all illegal it is potentially dangerous.
iii) The lack of farside indicators means that at busy locations where there is a number of pedestrians waiting to cross the road the pedestrians close to the nearside signal will be blocking the view of everyone else, so they will not be able to see any indication of when it is safe to start crossing the road.
iv) The lack of a signal that is visible to pedestrians actually crossing the road does not inspire confidence. When crossing roads at signal controlled locations the pedestrians still like seeing an illuminated sign conforming that they have the right of way / the traffic signals are still working, which is not possible if the only signals are out of sight on the footpath.
Perhaps a logical conclusion to solve the issues raised in point No. ii) above would be for Puffins to have both nearside and farside signals advising pedestrians when it is safe to cross. After all, with farside signals being a tried and tested way of doing things which has existed since the late 1920's (plus accepted practise in so many countries overseas too) so it is hardly surprising that the introduction of a type of crossing which is different (because it requires pedestrians to look somewhere new and unfamiliar) has lead to potentially dangerous confusion. The Panda Crossings were also 'different' in ways which created confusion - and were very quickly replaced with modified crossings which stood the test of time. Maybe history should repeat itself?
Why 'GNAT'? Since (in Britain) most of the types of designated pedestrian road crossings are named after animals it seems appropriate to name pedestrian controlled traffic signals which create traffic congestion after an animal too. The name 'GNAT' is eminently suitable for this, as it shares some attributes with the other types of controlled crossings (as described above) in being both an acronym - in this case for 'General Nuisance All Traffic' - and a real animal, albeit one which people find unwelcome and unpleasant! A dictionary described gnats as "various kinds of small biting flies".
Well, in theory this should not be. But, alas, it seems that some Puffin and (especially) many Toucan crossings are either malfunctioning - or have been incorrectly set-up - in which case it can be assumed that there are a LOT of poorly trained signal installation engineers who desperately need retraining - and should not be allowed to continue working until this has been accomplished.
These signals are supposed to detect when pedestrian(s) are crossing the road, and if there is a large group or the person is walking slowly then the computer system will give them extra time to cross the road by delaying the change back to green for the road traffic. For elderly and otherwise infirm / disabled pedestrians this is seen to be a much more equitable mode of operation than the situation with Pelican crossings, which after a pre-set number of seconds will change to flashing amber irrespective of how quickly (or otherwise) they are walking across the road.
Instead many of these pedestrian controlled signals seem to hold the traffic for as much as a further ten (10) seconds after the pedestrians have crossed, needlessly adding to traffic congestion, air pollution, etc. It also aggravates vehicle drivers, this being something that ultimately can be seen as a contributory factor in 'road rage'. This is what makes them GNAT's!
The cause seems to be that the 'variable clearance' period which detects when pedestrians are crossing is not working... so the signals default to staying on red for the maximum permitted time after the pedestrians have crossed. This explains why it is being suggested that either they are malfunctioning or have been incorrectly configured upon installation.
Another issue relates to the length of time they take after the 'call' button has been pressed before they change in favour of the pedestrians. Although this has not been timed on a stopwatch the impression gained is that it can be as much as a minute, which also seems to be excessive. Both pedestrians and road users have equal rights to use the same section of roadway, and there is a need for a balance which respects those rights without (as far as possible) being disadvantageous to the others.
The signals seen in the youtube clip detailed below fall foul of this, and could even be said to suffer from a split personality. At normal times they too keep pedestrians waiting - but in the rush hours they change in favour of pedestrians *very quickly* after the call button has been pressed. Problems arise however if the button is pressed (by more arriving pedestrians) towards the end of an activation cycle, as even though barely 3 vehicles (per lane) are able to pass them they will still change back in favour of the pedestrians almost immediately. In the most extreme instances (eg: morning rush hour) this can and does result in the entire section in front of them as far as the roundabout being empty, whilst behind them there is a 10-15 minute queue. In the evenings the same happens on the eastbound carriageway, with traffic sometimes tailing back to and even partially blocking the roundabout. Perhaps this is also a traffic detection issue, however even if it suggests a malfunction, of one sort or another.
A 101 second video of a Toucan crossing demonstrating the long delay between the pedestrians crossing and then changing back to green for the road traffic has been placed on the 'youtube' file-sharing website and can be watched (in a new window) by clicking either the projector icon or here - http://youtube.com/watch?v=dM3xF3Egm1A. Note that the three sequences shown were filmed with slightly different camera settings, which explains why the images are darker / lighter than each other - the 'default' setting was too dark, so different settings were tried, but the result was only discernable after the video had been downloaded to the computer.
The phrase Traffic Calming is a generic term which refers to a collection of methodologies much loved by urban planners and traffic engineers that aim to slow down and / or reduce traffic levels.
Often traffic is calmed with the publicised aim of increasing safety (either for road traffic, pedestrians, or both). However many vehicle drivers see the use of the phrase ' traffic calming' as an oxymoron and suggest that its real meaning is best understood as being 'driver annoying' with in the most extreme situations the result being 'road rage', as described elsewhere on this page.
Sometimes traffic calming is the result of political motivation with the express aim of trying to force people out of their cars, with the above cited reasons just being used as 'window dressings' to make what is being done appear palatable, and even reasonable. It is not unknown for even main roads to be 'calmed', even though this negatively affects bus services as well. It is very difficult to understand how making bus travel slower will make the buses appear attractive in a way that will entice people who drive to leave their cars at home and use the public transport instead.
It should be noted that these comments do not apply to what are known as Home Zones which are roads or collections of roads where there is very little traffic with the layout of the footpaths and roadway being completely redesigned to create space for and to encourage outdoor living such as existed before the days of motor transport.
Sometimes traffic management schemes will see the introduction of (often complex) one-way street systems designed to funnel road traffic through certain roads.
It is not at all unusual for this to result in road users being prevented from easily reaching where they wish to go - or forced to drive a 'long way around' which is much further (in distance) than they would otherwise have needed to drive. Usually this will add to journey times and local air pollution too.
Traffic calming methodologies include:-
The latter three involve creating small sections of road which are physically higher than the adjoining sections of road, with the express aim of making travelling over them uncomfortable, as this (it is hoped) will force the vehicle driver to travel over them at reduced speed. According to the Transport Research Laboratory (TRL) Report No.417 speed humps only work when they are uncomfortable.
Despite being a legal requirement that road humps / cushions / tables are signposted, sometimes this is not done.
Speed humps (which are sometimes also known by the nickname of 'sleeping policemen') usually extend over virtually the entire width of the road whilst as a contrast speed cushions are typically between 1.3 metres and 1.9 metres in width. Usually there will be several speed cushions arranged across the width of the roadway with between two and four usually being sufficient for most roads. Narrow roads (or roads which also have footpath build-outs to reduce the width of the traffic lanes) may only have a single speed cushion. Also factors here will be the width of the speed cushions, the spacing between the speed cushions, the type of traffic expected and other criteria. To make life easier for cyclists Department for Transport guidelines suggest that there is a gap of at least 750mm (but preferably 1 metre) between the cushion and the kerbs. The guidelines also suggest that ideally the gaps between cushions should not exceed 1 - 1.2 metres. On roads which are served by buses they suggest locating the cushions so that the buses can straddle them, which means drive over them with all their road wheels remaining on the road surface, as this will help minimise discomfort to bus drivers and their passengers. For cars however the general idea is to force them to drive over the cushions with the wheels on at least one side actually travelling on the surface of the cushion.
Speed tables are akin to flat humps which stretch out over a section of road. Often they are located at junctions, with the aim of reducing collisions by forcing all vehicles to travel very slowly at the specific location. Speed tables are also sometimes used in preference to speed humps to reduce the impact on long wheel base vehicles such as buses.
Whilst the use of physical solutions which involve raising all or part of the road surface do seem to be successful in making roads unattractive and thereby (where there are alternative choices) reducing the numbers of vehicle which travel along them the increased use of physical solutions has not found favour with some of the people who work in the public transport, emergency service, medical, cycling and motoring industries.
One reason why the motoring industry sees them as potentially creating a serious threat to road safety is because they can damage vehicles, especially their suspensions. Even though there are legally prescribed limits on the dimensions of the road humps (which it seems are not always adhered to) it is claimed that the extra wear and tear damages vehicles (tyres, ball joints, springs, shock absorbers, misaligned wheel tracking, etc.,) resulting in an increased possibility of failure and - especially at high speeds - serious accident. Motorists also lose out financially when the damage results in MOT test failures, requiring expensive repairs. It is not unknown for parts of vehicles which have a very low ground clearance to strike the speed humps, even at very low speed eg: 10 mph. From personal experience this has been known to damage a vehicles' gearbox, although exhaust systems are also easily damaged in this way. It has been known for vehicle passengers to suffer serious and permanent spinal injury simply because the vehicle travelled over a speed hump.
Whilst local residents are usually pleased with the reduced speeds it has been found that the constant slowing down before passing over the hump and acceleration afterwards increases noise and vibration levels, especially with large commercial vehicles. TRL report No. 482 found that in extreme cases there was also subsidence of the road and buildings alongside due to the ground pressure waves that are created. In some areas it has also been found that 'joy riders' driving stolen cars derive much pleasure by riding over them as quickly as they can, not caring that it destroys the vehicle they had stolen.
Environmentally it has been found that in addition to the noise pollution detailed above the constant slowing down before passing over the hump and acceleration afterwards increases fuel consumption and air pollution. TRL report No. 482 found that the mean emission rates of CO, HC, NOx, and CO2 from petrol non-catalyst, petrol catalyst, and diesel cars increased by up to 60% following the introduction of traffic calming measures, with even higher numbers over more "severe" measures such as speed bumps. In addition the use of bumps and cushions seems to encourage the use of larger vehicles which are more polluting. This is probably because the human occupants find that negotiating hump-style traffic calming measures is less uncomfortable in the larger 'all terrain' vehicles.
Cyclists see full width road humps and speed tables as just downright dangerous, with there having been instances of motor cyclists sustaining serious injury after being thrown from their bike and (especially pedal cyclists) trying to negotiate them at an angle and instead losing their balance and falling on to the road, sometimes in the path of oncoming traffic, with fatal results. Speed cushions are usually less of an issue here, as the cyclist can ride on the flat road surface between the humps.
The emergency services object because full width road humps and speed tables increase their attendance times for emergency calls (potentially as much as 10 seconds per hump), thereby risking the lives and property of the people. The Chairman of the London Ambulance Service claimed that speed humps are killing hundreds of Londoners by delaying 999 crews, with more lost because of 'traffic calming. than the 'calming' actually saves. It is known that especially for heart attack patents even a minute in delay can be enough to make the difference between survival or otherwise. This is in addition to issues related to the increased wear and tear on vehicles. It is claimed that to minimise the risk of hump-induced back injuries some police officers prefer to avoid patrolling along roads with speed humps / cushions / tables of any sort.
The ambulance service also objects because of the discomfort and possible injury that may be caused to their passengers, especially to patients with spinal injuries, who in some (thankfully rare) instances have been known to suffer severe and permanent disability (paralysis) as a direct result of travelling over a speed hump in an ambulance.
In addition to the increased wear and tear on their vehicles which may be travelling over many speed humps every day bus companies dislike speed tables because of the injury risk to their drivers and passengers. It has been known for bus drivers to be so alarmed about the potential threat to their health that the introduction of speed humps along bus routes has lead to them going on strike, with in some cases the buses even being permanently diverted along different roads as a consequence.
Speed humps are also blamed for making roads inaccessible for disabled people & hearses.
Speed humps are also cited as creating additional road maintenance costs because after a couple of years the road surface before and after the hump tends to develop potholes. In addition to fully resurfacing the road it is often necessary to remove and replace the speed humps, which also adds to the cost even further.
Some local government areas found that when studying the effects of speed humps on accident reduction they found that other solutions were more effective / would represent better ways to spend money. In the mid 2000's the London Borough of Barnet adopted a policy whereby as roads become scheduled for resurfacing they removed the humps on a permanent basis. At the time other London boroughs cried out in horror, but subsequent statistics have not supported those organisations which foresaw a deluge of accidents as a result of this policy.
Apparently the law requires that speed humps are no more than 4 inches (10cm) high, clearly signposted and well lit. However its not just the height which is important, as it is the angle of the incline which often makes driving over them so uncomfortable and potentially hazardous. Many people believe that it should be possible to drive at 25mph in a hump-strewn 30mph zone, but fearing damaging their vehicles (and themselves) most people slow down to much lower speeds. Sometimes accidents occur near to speed humps / cushions / tables of any sort (and chicanes) caused by a driver braking sharply for the obstruction in the road when the following driver knows they can be safely negotiated without slowing down.
When encountering speed cushions many people often chose to drive so that the cushions can be straddled by their wheels, which on wider roads where there are often three (or more) cushions will often result in them either driving very close to the kerb or down the centre of the road (this is also a primary cause of misaligned tracking and damage to tyre inside shoulders). Deviating off the sensible and natural line of the road in order to negotiate speed cushions (and chicanes) is sometimes blamed for creating conflict where none existed before, resulting in increased numbers of accidents - both with other vehicles and with cyclists. As an aside, driving so that the cushions can be straddled by the vehicle's wheels is the worst option for damaging the suspension and tracking, resulting in increased tyre wear, and worse.
As previously stated, many people who suffer from medical conditions such as back problems (one of the most common medical complaints), recent abdominal surgery or other disabilities find that travelling over speed humps / cushions / tables of any sort can be extremely uncomfortable, even painful.
Some people suggest that any form of traffic calming scheme is missing the point. They suggest that roads are for vehicular traffic and put the blame for any accidents involving pedestrians solely on the pedestrian involved (it is not known what they think of drunk or drugged vehicle drivers). They also advocate that instead of making cars avoid pedestrians, measures should be taken to prevent pedestrians being on the road. This could involve fences, footbridges and designated signalled crossings. They see many instances of traffic calming as being about as sensible as making trains stop at level crossings so as to allow the road vehicles to pass.
Other people suggest that for residential areas the most effective way to slow traffic is to remove the footpaths, pave the entire area in a way which does not create any specified areas for vehicles or pedestrians and impose a 20mph (30 km/h) speed limit.
To a certain extent people's attitudes towards road transport will depend on whether they drive a car or otherwise.
It could be said that people have a love / hate relationship with cars. Everyone who drives or who access to a close relative who drives will cherish the freedom they gain to travel where and when they choose. But hardly anyone truly likes the traffic congestion, and almost everyone actively dislikes the noise, smells, pollution, and danger which all too often result from road traffic. Especially fossil fuelled road traffic.
Additional information sourced from these pages: (links to external sites which open in new windows)
Copies of the TRL Reports No. 614 and No.482 can be obtained from the TRL website at http://www.trl.co.uk
Direct links to the reports quoted here can be found below...
482 - here.
614 - here.
It is said that when carrying out vehicle trials in order to gain information to use in report No. 614 a London taxi suffered serious damage in the speed-cushion tests, but this has been hushed up. Not having seen the report personally this information remains unverified.
Direct links to other pages within the theme...