And whats to stop you from:scratch339 said:
1) Getting out of the car.
2) Taking the camera.
3) Kicking the f*ck out of them.
4) Drive off.
The previous comment is in part jest maybe, but if the police/government want to give 'old biddies' the job of setting up speed traps then they are putting them at great risk as some people wouldn't think twice about doing the above.
Mark