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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.
It is rare to make the entire trip between Canberra and Sydney without at least one police speed trap. The city of Goulburn, on the way to Canberra, is the training centre for New South Wales police officers and often send new recruits to run speed checks on the freeway.