After spotting a police car with two huge boxes on its trunk — that turned out to be license-plate-reading cameras — a man in New Jersey became obsessed with the loss of privacy for vehicles on American roads. (He’s not the only one.) The man, who goes by the Internet handle “Puking Monkey,” did an analysis of the many ways his car could be tracked and stumbled upon something rather interesting: his E-ZPass, which he obtained for the purpose of paying tolls, was being used to track his car in unexpected places, far away from any toll booths...

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