VASCAR
Device measuring the speed of a moving vehicle / From Wikipedia, the free encyclopedia
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VASCAR (Visual Average Speed Computer And Recorder) is a type of device for calculating the speed of a moving vehicle. The first VASCAR device was created in 1966 by Arthur Marshall.[1] It is used by police officers to enforce speed limits, and may be preferred where radar or lidar is illegal, such as some jurisdictions in Pennsylvania,[2] or to prevent detection by those with radar detectors.[3]