Here in the UK we have CCTV at almost every corner, ANPR cameras on all major roads and all entry and exit points of major towns. There are also speed, red light, and parking enforcement cameras. The argument used to be "If one has done nothing wrong rhwn one has nothing to fear". Whether this is valid or not it has still led to us being unable to leave our houses without being seen/tracked if they want but there has been no reduction in crime; seems the criminals are the only ones who manage to go unseen.
Unfortunately the safer the driver of a car FEELS the more danger the rest of the road using public are in. The best road safety innovation would be a large spike in the middle of the steering wheel which spears the driver on impact... then cars wouldn't crash!
That's the whole point, they're using GPS for the speed monitoring so it is independent of the car's workings... apart, presumably, for a need for electricity.
It isn't difficult for them to make it illegal to drive a vehicle with a defective one, after all, this has been the case for years with tachographs in commercial vehicles.