That's already happening :) If you have an automatic toll transponder (ez-pasz, etc.), those things are read very frequently even when you're not going through

That's already happening :) If you have an automatic toll transponder (ez-pasz, etc.), those things are read very frequently even when you're not going through a toll meter. There's info on this online. TPMS sensors also transmit a serial number. I wouldn't put it past the NSA to have sensors embedded in certain roads to track that. And of course, dragnet automatic license plate scanning / tracking is already ubiquitous and there's really not anything you can do about it. Use a bicycle instead, I guess...