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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 familiar police speed-gun radars are a well-known. application of radar for law enforcement. Radars are also. used by many Federal agencies for intrusion detection systems. in various protected areas. Lately, land-based, airborne, and shipborne radars are being employed in Federal law. enforcement efforts.