It seems like camera or radar systems at intersections would be easier for advanced warning of someone running a red light than having to fit every car with a r

It seems like camera or radar systems at intersections would be easier for advanced warning of someone running a red light than having to fit every car with a radio that broadcasts its speed etc. Apart from that, this is a concept that's a long time coming, but assuming it can be made sufficiently anonymous and optional, seems like a good idea. Like maybe cars should only broadcast a random percentage of the time so that it doesn't look weird for a car not to be broadcasting.