i think dave means the Average speed cameras ,,,the yellow ones now on motorway road works..........
SPECS Speed Cameras
SPECS average speed camera systems utilise state of the art video system with Automatic Number Plate Reading (ANPR) digital technology. Consisting of a minimum of two cameras each fitted with infra red illuminators fitted on gantries above the road, so they can work day or night. SPECS speed cameras work out the vehicles average speed, given the time it takes to drive between the two camera positions.
SPECS Speed CamerasSPECS average speed cameras are fitted either at the roadside or in the central reservation (as pictured below) a set distance apart to create a speed controlled zone, or where appropriate, groups of cameras can be linked to create a speed controlled network.
As vehicles pass between the entry and exit camera points their number plates are digitally recorded, whether speeding or not. Then, by ANPR recognition, the images on the video of matching number plates are paired up, and because each image carries a date and time stamp, the computer can then work out your average speed between the cameras. There is no film used for SPECS.
SPECS are commonly used to enforce speed limits on dual carriageways and motorways. This is because one SPECS gantry can monitor up to four lanes of traffic at any one time.
Nottinghamshire currently has the most SPECS speed cameras with no less than 43 pairs all located in permanent sites.
