funny stuff. Radars suck. They'll clock a standing tree going 90 miles an hour. They are one of the worse guages of speed (for the law enforcement) but is still stands in court.. Unless you've done your homework.
The best measurement is the laser (and even then it's not foolproof) and the distance measurement. Where they'll be two lines across the road at a set distance from each other. The officer will time the seconds it takes for a vehicle to pass from one line to the other. If it's before a set number of seconds (adjusted for human error), then the vehicle couldn't be driving the speed limit and gets ticketed.