Do you have an E-ZPass electronic tag? Have you received a notice in the mail indicating you were speeding on a particular date and time, or to enquire why your vehicle was traveling on the I-95 corridor on a specific date? The tag is a commuter convenience, and a law enforcement tool, as noted by this article that describes how the technology was used in the investigation into the recent death of an Assistant U.S. Attorney. But privacy issues associated with transportation surveillance also merit review.