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How do speed camera vans work?

Mobile laser systems are often found in vans, which can target vehicles from short or long range. The laser is aimed at the number plate and the returned signal bounces back to the gun to determine the speed. Evidence of which number plate was targeted is recorded on the video, or may be noted by the operator. Laser is a very accurate system, with a speed acquisition time as little as 0.3 seconds. T his is the reason laser guns are being used rather than the old-fashioned radar guns, which found it hard to determine which car was the target. There are various types of laser equipment in use, but all currently use the same 904nM light beam
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