The Essex Casualty Reduction Board | Enforcement

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The Essex Casualty Reduction Board
> Enforcement
> Safety Cameras
> Average speed cameras

Average Speed

As a vehicle passes the first camera, an infra-red photograph is taken and transmitted to the control computer along with the time the image was taken. As the vehicle passes the second camera, two pictures are taken, an infra-red photo and a colour photo. These are also transmitted to the control computer along with the time the image was taken.

The computer analyses the photos to retrieve the registration number of the vehicle. The computer then compares the times of the two infra-red photos. These are used to calculate the speed of the vehicle between each camera.

If the speed is above the threshold, the information (speed, date, time vehicle registration etc) is written to disc which is then checked by the police/enforcement officer.

Unlike traditional cameras which measure spot speeds, pairs of digital cameras can be placed up to 10km apart creating "Speed Control Zones".

Drivers are less likely to break suddenly for a camera and are more likely to keep their speed down over a longer period.