Not only that, but if they can see how fast you were going AFTER a crash, what's to stop them from seeing how fast you're going at any time they'd like to check?
For instance, they could rig the unit into a radio system similar to the ones GM calls the "OnStar" system. If you go over the speed limit, the damn thing could dial out and alert the "boys in blue" that you're going a bit fast. In fact, with the onboard GPS they could even see exactly where you were and send you a ticket in the mail with the date, time, location, and speed that you were traveling in excess of the posted limit.
Isn't technology great? :(
DING DING DING! You win!
There was a lawsuit a few years back to keep OnStar data private - seems that they wanted to access pre-crash data to determine rate of travel and direction that is logged prior to the accident. The data was kept private.
Seems like I read of a car rental agency that had installed a similar device.
They'd read it after the car was turned in and charge extra if it had recorded what they considered excessive speed.