However, once safely out of a Gatso's visual range, a driver might be tempted to resume driving at illegal speeds. Where linked average speed cameras are used instead, there really is no escape — the only way you can guarantee avoiding average speed camera fines is to comply with the limit. Officially, average speed cameras are located wherever traffic speed has been identified as raising safety concerns.
Common locations are along busy stretches of A-road, be they single or dual-carriageways, and temporarily in roadworks zones, especially on motorways. It's increasingly likely to find average speed cameras where local speed limits are enforced, such as urban 30mph schemes. In many cases, they'll be prominently positioned as you enter and exit a village, providing a further visual warning that an average speed detection system is in operation.
Variable speed limits do not typically use average speed cameras — ' smart motorways ' such as sections of the M25, M6 and M62 instead use fixed-point cameras named Hadecs 3.
Not necessarily painted in the high-visibility yellow of other speed cameras, these are typically mounted at the nearside of grey motorway gantries, although locations can vary. They operate whenever a temporary speed limit restriction sign is illuminated, but can also be used to enforce the national 70mph motorway speed limit.
These are usually mounted on roadside gantries at regular intervals of more than metres, although the latest SPECS 3 cameras need only be 75 metres apart. In terms of appearance, they closely resemble security surveillance cameras such as those found in urban public areas and are mounted in yellow plastic housings.
They're effective day and night, with infrared illumination sufficient to clearly capture number plates once it gets dark.
As well as being installed in permanent locations, SPECS cameras are also used to enforce temporary speed limits, for example during major roadworks, where lower limits are introduced for the safety of traffic and the construction workforce.
The latest VECTOR cameras look similar but are more versatile — as well as speed limits, they are used to monitor for offences committed at bus lanes, level crossings and traffic lights, and to enforce congestion-charging schemes. They can be mounted on their own gantries or attached to streetlamps or other tall urban street furniture.
They can be either forward or rearward facing and one camera can monitor two lanes of traffic. Both camera types incorporate automatic number plate recognition ANPR , which allows an offending car to be identified and linked to its registered keeper. Any average speed camera system requires at least two cameras linked together, but there's no limit to the number of cameras that can be combined in a system, nor is there any specific limit to how long an average speed camera network can be.
As an example, the A9 scheme between Dunblane and Inverness in Scotland is 99 miles from end to end, incorporating multiple networks of cameras with no route sections unmonitored. When a car passes the first camera in a linked sequence, an image of its number plate is taken and used to identify the car when it passes subsequent cameras. As the car passes along the route, the time taken to pass between the cameras is recorded, and if this exceeds a set baseline, the vehicle details are submitted to a prosecution database.
Individual cameras don't have the facility to measure vehicle speed — a car must pass a second camera for its average speed to be calculated.
In a sequence of multiple cameras, it is at the discretion of the local enforcement agency as to whether cameras work in pairs or in larger groups. Best speed-camera locators to buy If you have passed an average speed camera, you will have been recorded by it.
Only by ensuring that your average speed is below the legal limit can you ensure that a prosecution notice won't land on your doormat. Red tape, white lies. Speculative science. This sceptred isle. Root of all evil.
Ethical conundrums. This sporting life. Stage and screen. Birds and the bees. ALTHOUGH this may not be the answer you are looking for, if you travel within the speed limit you have nothing to fear from speed cameras. Dave Costin, Reykjavik, Iceland dave memphis.
If the questioner travelled at the velocity of light, the photons would be unable to catch up with him, and thus could not be reflected back to the receiver, and no speed would be recorded.
Following a Freedom of Information request to 45 different UK police forces, Auto Express has found the speed camera tolerances for forces in different parts of the country. The majority of police forces stick to the guidelines issued by the Association of Chief Police Officers which suggests that cameras should only activate when a driver is breaking the speed limit by 10 per cent plus 2mph.
This ruling allows for a top speed of 79mph on motorways and 35mph in 30mph zones and in applies to both fixed and average speed cameras. There are a couple of police forces who allow for extra leniancy, with the Metropolitan Police and Lancashire Police using 1o per cent plus 3mph. There were some forces who refused to divulge the information claiming that it would encourage speeding.
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