The potential for privacy problems is severe, but to their credit I
> don't think I've ever heard reports of abuses. Besides the
> possibility of tracking people by tag use, there's the violation
> tracking issue. If you drive through an E-ZPAss booth in NY with no
> tag or an invalid tag, a camera takes a picture of your car and they
> will ask the state DMV to look up the license plate number so they can
> send you a ticket.
The original private contractor for the NJ EZP system was notoriously, sending out many violation notices that weren't deserved. That strongly discouraged motorists from adopting EZP. Of course, now the NJTpk intends to eliminate the EZP discount, which is a stupid move since it removes the incentive for motorists to use EZP, esp occassional drivers. Result is more overcrowding in cash lanes.