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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.
If you want to fight your ticket, there are two things you must know. 1  Were you charged under an âabsolute,â âpresumed,â or âbasicâ speed law? (Donât worry, weâll explain this jargon in this article.) 2  How did the cop determine your speedâthrough pacing, aircraft, radar, laser, VASCAR, or other means.