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. Since 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.

As of spring / summer 2008 the film-based cameras which enforce these speed limits are being replaced with digital cameras. Since 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").

Evening peak-hour traffic congestion on the Mll entry slip road from the Redbridge roundabout and A406 (westbound).

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.

There are also some places where congestion is a direct result of the road authorities.

This view of an 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 feed into it - the A406 Barking to South Woodford extension of London's North Circular Road. Not shown are the feeble road signs 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 as its slowest, and always outside of their working time - so that it only inconveniences them, as this will help them to truly appreciate just how much their well / badly thought out decisions negatively impinge upon 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 create an extra 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)

Approach road sign on the A447 Stanningley Road in Leeds, West Yorkshire, which on Monday 11th May 1998 became Britain's first road with a HOV lane (applies to city-bound traffic only). Although initially experimental in nature, after encouraging results and just eighteen months, on Monday, 8th November 1999, Leeds City Council sealed the experimental traffic regulation order making the HOV lane permanent.
In Leeds the HOV system operates on weekday rush hours only. This view was taken where the longer special lane ends; the traffic signals (seen in the distance) only operate when the system is in force and their purpose is to hold back the traffic using the general purpose lane and speed the flow of the traffic using the HOV lane. Note the "2+ lane" road marking. Photographed on a non-working day, when traffic was very light.

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.

Keep your distance chevrons on the M1 Motorway in Leicestershire.

Recognising the importance of keeping a safe distance from the vehicle in front the French have modified the hard shoulder lane markings on their Autoroutes to help road users judge whether they are too close.

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 some experimental road markings were 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.

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.

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!

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, irespective 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.

Why?!

One reason why this situation has arisen is because positions of power have been 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.

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. Whats more, 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!

Since (in Britain) most of the types of designated pedestrian road crossings use traffic signal type systems, and that most designated pedestrian crossings are named after animals, it seems appropriate to name this policy after an animal too - with perhaps the most appropriate name being 'GNAT', which in common with the newest types of signalised crossings (as described below) is an acronym - in this case for 'General Nuisance All Traffic'. The name 'gnat' is also appropriate because refers to an animal which people find unwelcome and unplesant - a dictionary described gnats as "various kinds of small biting flies".

A 101 second video is available of one of the new style crossings demonstrating the long delay between the pedestrians crossing and them changing back to green for the road traffic. It 'might' be that these signals are malfunctioning, or have been incorrectly set-up; in which case 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. here or the projector icon to see this video. 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 I tried different settings, but could not properly see the results until I had returned home and watched the video on my computer.

When Penguins are good whilst Puffins & Toucans are GNAT's in disguise!

In addition to being names of types of animals Penguins, Puffins and Toucans are the names given to types of road crossings. Before explaining why some one is 'good' and the others 'less beneficial' it may be of interest to go into greater detail about the different types of road crossings. Whilst this will include some historical information it is not intended to be a definitive history.

Zebra Crossings.
In Britain most of the types of 'at grade' road crossing points for pedestrians are named after animals. This policy officially started in 1951 with the introduction of 'Zebra' Crossings, which are also noted for their orange flashing lights on the top of poles painted with black and white stripes and known as 'Belisha Beacons'. As with virtually all types of crossing which followed them Zebra crossings featured metal studs located across the approaching traffic lane approximately 15 yards from the stop line. These were a forerunner of the zig-zag lines used at crossings nowadays, and marked the start of an area in which parking or waiting was prohibited.

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.

Panda Crossings.
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.

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 illumiated '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 inaguration describing them as being 'hairbrained'. For many reasons including lectro-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.

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 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.

X-Way Crossings.
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 the crossing place. 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...

• an audible alert to inform blind people that it was safe to cross,
• a green man symbol instead of the word 'CROSS',
• constant indications for who had the right of way,
• a 'non animal' name.

Pelican Crossings.
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.

Puffin Crossings.
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, incorporting 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 push-button units and indicator lights on the left-hand side of the crossing, especially on one-way roads and on central islands of dual-carriageways, these being locations where traffic is approaching from the left.

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 accross hurredly. This facility replaces the joing 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 to 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 accross the road (not that they ever do!) at Toucan's the cyclists are allowed to ride accross. Sometimes Toucans are extra wide so that independent crossing lanes can be provided for the cyclists and the pedestrains, 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, and certainly at some locations can become a source of traffic congestion, making the road traffic wait as much as 15 seconds after the pedestrians / cyclists have crossed before changing, plus if in the meantime they have been 'called ' again they will change against the road traffic virtually instantly, having allowed barely 3 vehicles to pass. So from direct observation it seems that these crossings can become a direct cause of traffic congestion. At a toucan crossing the red pedestrian and cycle signals are advisory and if it is safe one can cross even when it is red.

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. Pegasus crossing feature taller poles and extra push button boxes mounted high on the pole for horse riders.

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.

Are Puffins Dangerous?

Whilst researching the different types of pedestrian crossings some of the information which came up on web searches talked of apparant 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.

The problem areas seem to be two-fold...
  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 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 illegal it is potentially dangerous.

Maybe Puffins Need Modifying?

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 Pelicans, Pegasuses, most Toucans and 'ordinary' road junction traffic signals having farside signals, plus that this is a tried and tested way of doing things which has existed since the late 1920's, so it is hardly surprising that the introduction of a type of crossing which is different (because it requires pedestrains to look somewhere else) has lead to potentially dangerous confusion. The Panda Crossings were also 'different' in ways which created confusion - and were soon replaced with modified crossings which stood the test of time. Maybe history should repeat itself?

So Why are Penguins 'good' whilst Puffins & Toucans GNAT's in disguise?

Well, in theory this should not be. But, alas, it seems that most Puffin and Toucan crossings are either malfunctioning - or 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) the pedestrians are walking across the road.

Instead most of these pedestrian controlled signals seem to hold the traffic for a further 10 seconds, 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!

A 101 second video is available of a Toucan crossing demonstrating the long delay between the pedestrians crossing and them changing back to green for the road traffic. Click here or the projector icon to see this video. 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 I tried different settings, but could not properly see the results until I had returned home and watched the video on my computer.

Apologies, some images will be missing and there may be spelling errors; the sections above and below are still in course of preparation.

Traffic Calming & Driver Annoying.

The phrase Traffic Calming is a generic term which refers to a collection of methodolgies 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 descibed 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 them appear attractive in a way that will entice people who drive out of their cars.

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.

Traffic calming methodiologies include:-

• lane narrowing,
• a reduction in the number of traffic lanes,
• partially blocking a road to enforce single alternate lane traffic (usually known as 'chicanes'),
• speed humps,
• speed cushions,
• and speed tables.

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 Report (TRL) No.417 speed humps only work when they are uncomfortable.

Whilst speed humps usually cover the width of the road speed cushions are usually spaced so that wide vehicles can drive over them with all their road wheels remaining on the road surface whilst the less wide private cars usually have to drive over them with the wheels on at least one side actually travelling on the surface of the cushion. Roads usually have several speed cushions spread out accross the width of the carriageway. Speed humps are sometimes known by the nickname of 'sleeping policemen'.

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.

Disadvantages

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 clearence 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 exhuast systems are also easily damaged in this way. It has been known for vehicle passengers to suffer serious and permament 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.

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 permament 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 permamently diverted along different roads as a consequence.

Speed humps are also blamed for making roads inaccesible 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 road become scheduled for resurfacing they removed the humps on a permament 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.

Traffic calming and increased accidents.

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 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 cusions 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 damaged tyres' 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 acces to a close relative who drives will cherish the freedom they gain to tarvel 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)
http://www.bromleytransport.org.uk/Humps.htm   http://en.wikipedia.org/wiki/Traffic_calming

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 - http://www.trl.co.uk/store/report_detail.asp?srid=2637
614 - http://www.trl.co.uk/store/report_detail.asp?srid=5477
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.