[blincoln]

I think vehicular homicide is a lot less likely than pranks (causing traffic jams, etc.), or people trying to game the system so that they always get to pass through intersections without stopping.

However, intentionally causing injury isn't something that should be ruled out, either. It's only "traceable" if someone is sending the signal from their own car, registered under their real name. If someone pulls the transmitter from a junked car (or build their own, etc.), they could e.g. conceal it near an intersection, wait a day or two, and trigger it remotely, or attach it to the underside of someone else's vehicle, etc.

Someone could also jam the signals to potentially cause everything to stop working.

I'm with the crowd that thinks this is an inherently bad idea. The data is entirely untrusted, which makes it essentially useless for determining anything other than "there seems to be a radio transmitter at a particular location", and that's only if there are enough sensors to triangulate signal sources accurately.