>>Yeah, they're radar, aren't they, and work on the Doppler Effect principle. The hand-held, multi-directional ones are called, I think, Vascar.
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> Vascar has nothing to do with radar. It's a simple time vs distance measurement to determine speed.
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>http://www.vascarplus.com/Pages/How_it_works.htm

I always thought the hand-held "guns" that the UK police used were Vascar.

While on the subject, do your police use a "breathalyser" to test DUI of alcohol - a gizmo that you blow into that registers the blood-alcohol level? Whenever I see progs like "The world's scariest police videsos" (or whatever), the troopers/traffic cops always seem to be farting around with the "sobriety test": standing on 1 leg, reciting the alphabet, walking a straight line, etc., but I never see the motorist blowing into anything.