Turning a speed camera on itself

This:

. . . [F]our youths from Canberra [Australia] recently pulled off a trick of breathtaking bravado to gain revenge on a mobile speed-camera van operating in the area. Three of the group approached the van and distracted the operator by asking a series of questions about how the equipment worked and how many cars the operator would catch in a day. Meanwhile, the fourth musketeer sneaked to the front of the van and unscrewed its number plate. "After bidding the van operator goodbye, the friends returned home, fixed the number plate to the car, and drove through the camera's radar at high speed -- 17 times. As a result, the automated billing system issued 17 speeding tickets to itself.