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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.
The day JFK was shot his car was moving much slower than the 45 mph minimum dictated by Secret Service protocal. Notice in live footage how the foot patrol agents were called off just before the kill zone. The driver slowed and looked back twice to confirm that the kill was good. THEN he sped up.