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Ontario Highway Traffic Act
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L.I.D.A.R. Light Detection And Ranging. Speed is calculated by time of flight...A pulse of light goes out at a known speed, a timer is started...a portion of the beam is returned to the source and the time is stopped. Knowing how long the pulse of light has been gone will give you a distance. Two pulses can be compared to calculate a speed. This process happens many times to keep calculating speed.