Big question is, how would you do it at scale? You can crowdsorce data, but then it's hardly precise or frequently updated data. Sort of a thing that vinwiki does now. Govt has a head start on it with speed cameras/traffic light cameras etc, but there only so many of them.

The wildest idea I can think of is using reverse camera on every car and recognizing the plate of the car which is tail gating you. Now, that's more interesting, but how much of a fleet you would need to track down a random car.

Not something car manufacturers would do either, even with their love of telemetry.