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The radar beam. hits oncoming cars, and is reï¬ected back. to the radar unit, which can calculate. speeds from those reï¬ections. Radar can be used from a police car. thatâs either stationary or moving, since. it does not require precise aiming to. clock traï¬c speeds. There are also hand-. held units that can be operated from a. car, motorcycle, or an oï¬cer standing at. the side of the road.
1 Or put another way, if you are driving 40 mph in a 45-mph zone on an icy road in heavy fog, a cop could sensibly conclude that by driving too fast for road conditions you are in violation of the âbasicâ speed law. 2  This type of ticket is mostly handed out after an accident. Most states have an âabsoluteâ speed law. 2  There is no trick to how this works: If the sign says 40 mph and you drive 41 mph or more, you have violated the law. 3  Presumed. â 4 Presumedâ speed-limit violations are a little more complicated but give you far more flexibility in building your defense.