Quote Originally Posted by BiH1320
But where the hell are the airplanes and how do they know ur tag number if they are all the way up in the sky?
its seems to be a old technoque of using a helicopter or light aircraft to measure how fast a car is going by timing it between 2 points. But with someone guessing/having to reacting to seeing a person hit a point and start and stop a clock makes it very hard to get a right speed. But they would use this and call in a vehicle description to a patrol car that was waiting up ahead.