Never seen a photo radar system that displays the speed to the driver. Whenever I've seen a device that displays the speed, it's usually just one of those radar trailers that they put in neighborhoods (my department has a couple). Ours don't photographs or video tape, and no ticket is issued. It's just there to advise drivers of their speed.
And the beam is sent down the road, so if you were close to passing it, it probably wasn't picking you up, but rather a car down the road more directly in it's beam path.
Pittsburgh Pirates- 1st place NL Central 7/15/11
They've got us surrounded? Good. Now we can fire in any direction, those bastards wont get away this time
An amateur will train until they get it right. A professional will train until they can't get it wrong.