How Lidar Speed Detection Works: What Ontario Drivers Should Know
If you've received a speeding ticket in Ontario, there's a good chance it was based on a lidar reading. Lidar—Light Detection and Ranging—has become the predominant speed detection technology used by police across the province. According to NextLaw's analysis of speeding cases, understanding how lidar works can be essential for evaluating your defense options.
How Lidar Technology Measures Speed
Jon Cohen, who has challenged lidar evidence in thousands of speeding cases, explains the basic principle: unlike radar, which uses radio waves, lidar uses pulses of infrared laser light to measure speed.
The device emits a series of laser pulses toward a target vehicle. Each pulse travels to the vehicle, reflects off it, and returns to the device. By measuring the time each pulse takes to return and comparing multiple readings, the device calculates how fast the distance is changing—which gives the vehicle...
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