There were car rental companies that used GPS trackers to "fine" renters for driving too faast. They lost in court over doing that, but what would stop a government entity from doing the same thing. Of course, we will get people saying it's ok, just follow every rule and the government is your friend. Just like Soviet Russia. Yup.
Check into how the government currently tracks commercial vehicles. Most 18 wheelers are equiped with a satilite tracking device, when stopped by a law enforcement officer anywhere, they can check back and see where I was and how fast I was driving. The electronic diesel engines in most trucks also keep track of speed,RPM and other things like how many times you applied your brakes. (If you apply your brakes a lot, it proves you were following too close.) It is only a matter of time before the same technology is applied to private vehicles. You are already there if you have Onstar or something similar. Goes back to my favorite movie, Enemy of the State (Gene Hackman,Will Smith)