Do they take front on photos with the camera positioned front on (to the car), rear on photos with the camera positioned at the rear of the car or side on photos with the camera positioned on the side of the car? And how far from the road do they need to be for a accurate picture? This question is in relation to a mobile speed camera.
Fixed or mobile speed camera systems that measure the time taken by a vehicle to travel between two or more fairly distant sites (from several hundred metres to several hundred kilometres apart) are called automatic number plate recognition (ANPR) cameras. These cameras time vehicles over a known fixed distance, then calculate the vehicle's average speed for the journey. The name derives from the fact that the technology uses infrared cameras linked to a computer to "read" a vehicle's registration number and identify it in real-time.[1]
In principle, it is not possible (as in the case of a single speed camera) to slow down momentarily while passing one of the cameras in order to avoid prosecution, as the average speed over a distance rather than the instantaneous speed at a single point is calculated.
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