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As GPS systems continue to improve, we are just a few short years from continuous speed monitoring for all people in all places at all times. And since your car is electronically controlled, the government can hold your speed to the posted limit for all people in all places at all times. Heck, the limit doesn't even have to be posted. If you are on a 35mph road, the Brain Police will know it, and 35mph will be all that your car will do. It can easily be completely automatic.
People who laugh at the crazy conservative anti-government crowd might just consider that this is the kind of thing that the crazy conservative anti-government crowd has always been fighting against.
Needless to say, the legislators will exempt themselves, because that's what legislators do.