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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.
Speed in miles per hour (mph) If something is traveling at 1 mph it moves 1 mile every hour. It is a slow walking pace. One hour walking at 1 mph moves you 1 mile. Miles per hour is often used for car speeds. Example: Highway speed is around 60 mph. One minute at 60 mph will move you 1 mile.