[aestra]

IIRC, In New York City and the northeast there is EZPASS (an RFID device that automatically deducts a toll to your prepaid account). Someone altered theirs EZPASS to track when their EZPASS was read. Basically it was read all over the city far away from toll booths.

Here's the article: http://www.forbes.com/sites/kashmirhill/2013/09/12/e-zpasses...

EDIT: Seems that New York Department of Transportation is doing this.