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How are the ways cops know we are speeding?

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There are a variety of speed-detection methods and devices. One of the most common ways is to pace the target car. As CJ Brown said, the officer can pull behind the target car and check how fast the target car is going. read more

If the average speed is above the speed limit, it establishes that the vehicle was travelling at least that fast during some portion of the known distance. And, finally, there are some very special circumstances when officers can say that their observations led them to believe that the vehicle was speeding. read more

Many cop cars come with radar guns built into the front (and possibly the back) of the vehicle. Part of the console panel displays a digital readout of the car in front's speed. It uses the cop car's speed, and either adds or subtracts it to the suspect's speed, depending on whether the car is coming in the same or opposite direction. read more

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