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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.
For example, if you are driving 45 mph in a 55 mph speed zone during a dense fog, you could be cited for driving âtoo fast for conditions.â You may never legally drive faster than the posted speed limit, even if you think it is safe to do so.