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I roam around all over the North Florida backwoods, on an electric mountain bike, with a sack of cameras, and a GPS.
When I get home, I hook the GPS to this computer, and it downloads every detail of My trip, in the form of a track, overlaid on either a photo or topo map. I can scroll over the track, and get readouts of the speed I was running at any point, and the time I was there. It is so accurate it is amazing. I have no doubt that the military has carried the technology much further than the primitive stuff I have, and I do not doubt that it is possible to track the car and measure the speed. My software also allows Me to measure distances, all You'd need is two points on a map, and the time difference involved. The GPS concept depends on very accurate atomic clocks, figuring speed would be a snap.
You don't need a GPS to play with the software. Do a google on USAPHOTOMAPS, install it {freeware}, type in Your address, or any other, and have a ball.
http://photobucket.com/albums/v244/tsiya/