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How can Speed Detection Devices that are mentioned on road signs work?
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How can Speed Detection Devices that are mentioned on road signs work?



    




stephenn1998
Rating
they're just first gen low tech radar guns.


Chris
It's police radar guns. The high-tech version emits a signal and measures the speed at which the signal bounces back off the car. They have clever little techies in the police department, who have figured out how to measure the signal bounce and that tells them how fast the vehicle is moving.

The low-tech version is they hide in the bushes with a bucket of red paint. As you drive by, they fling it at your windshield. You panic and lock the brakes, they measure the skid marks to figure out how fast you were driving. (This is illegal in a couple of states.)





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