That's a great way to make them targets for vandalism. I'm in a city they're about to get in to (Nashville), and if the snitch-mobile tattled on everyone (the highways here that are officially 55 are "really" 75 with some exceptions, and going the speed limit can end up being more dangerous), sensors would start getting bullet holes.

Of course, unlike the normal car break-ins here, the cops might do something about them.