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How do average speed cameras work?

average speed camerasAs motoring solicitors we are seeing more and more cases inolving average speed cameras.

Initially they were used on motorways when there were road works. Anyone who drives along M1 between  junctions 25-28 will be familiar with them.

We have now been told that the average speed cameras will stay on the M1 after the roadworks are finished. It was also announced today that average speed cameras will be introduced into an urban area for the first time. Average speed cameras will be installed along a 7 1/2 mile stretch of the  A13 east of London.

So how do average speed cameras work? Unlike traditional speed cameras it is no use braking when you see one and then speeding up, as the name suggests they work out the average speed between 2 points.

The cameras can be located between 200 yds and 10Km apart, normally they are fairly close together.

Each camera has a ‘pair’, an entry and exit camera.  The camera recognises your number as you go past the entry camera and then again as you go past the exit camera. They then work out the time it took and your average speed. If you are above the speed limit then you will be prosecuted.  The cameras to be installed in London are made by RedFusion – their website states –

“Initially, lane specific cameras, utilising Automatic Number Plate Recognition (ANPR) software, capture and record details of a passing vehicles license plate. This information is then sent via a public network to a centralised computer. As the vehicle travels along the carriageway it then reaches a second set of cameras at which time its license plate details are captured and recorded for a second time. Again this information is sent to the central computer where the data from the two readings is matched and analysed. By using the data from this analysis it is possible to measure a vehicles average speed by looking at the time taken to travel a known distance. When the system calculates a speed that is above the desired threshold a violation file will be created.

By using multi point to multi point technology, RedFusion is capable of offering accurate speed measurements even if a vehicle changes lane or leaves the particular carriageway being monitored, reducing potential incidents caused by vehicles changing lane in order to avoid detection and in turn ensuring maximum possible offence detection.”

The good news is that there will be a series of photographs taken between the average speed cameras. This should help identify the driver and avoid the many cases where drivers are unable to recall who was driving and face 6 penalty points as opposed to the 3 for speeding.

Do you need legal advice relating to a speeding offence?  Call us now on 01623 397200 for free initial advice.

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