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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.
Following Emergency Vehicles. Most states have laws prohibiting any vehicle from following within 500 feet of an emergency vehicle. Some states also have laws prohibiting entering a city block where emergency vehicles are stopped with their lights flashing to prevent interference with the work being done.Move Over Law. Between 1999 and 2009, more than one emergency worker per month was killed while aiding a motorist by the side of the road.hese laws require motorists who are approaching an emergency vehicle on the side of the road with its emergency lights flashing to move over into the opposite lane. If you are unable to move over you should slow down, in some cases to 20 mph below the posted speed limit.