[lambda]

Every car is legally equipped with a tracking device known as a license plate.

There are no more toll booths in the state of Massachusetts.

If you travel on a toll road in Massachusetts, your car will be tracked either by E-ZPass transponder, if you opt in to that system (at a substantial discount), or via photographing the license plate and sending you a bill in the mail.

Also, pretty much everyone I know, even the most privacy conscious, carry a tracking device in their pockets at all times. I think that rms may be the only person I've met who I know does not.