Danger! Dispatches from the privacy front, part 1

This New York Times item is now archived, but the abstract makes the point.

Built-in automotive communications and tracking systems and electronic toll areas, while enhancing driving safety and convenience, also increase potential for surveillance; privacy advocates say rise of such technologies are changing nature of Americans' relationships with their cars.

Simply put, what used to be thought of as a zone of privacy is increasingly a way for you to be tracked and even controlled (see part 6) more efficiently.