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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.
How Speed Limits are Determined. There are entire career fields in which people study safe speeds. There is a legal responsibility to follow posted speed limits. There is a conscious choice that people make when deciding whether or not to speed, and therefore, a person is acting recklessly if they are surpassing the posted speed limit. When a person decides to ignore speed limits and causes a car accident, they can be held responsible for their victimâs pain and suffering.