From what I gathered from the radio the other day is they now have the ability to plant a tiny chip for example the inspection sticker or registration sticker in you vehicle to keep tabs on your locations past, present (nice to know) and can keep a tally on your miles driven
Massachussetts was the state I heard going to this to give rebates to "low milers" on the giant gas tax increase to offset the lifting of "some" toll fees on I90.
George Orwell sure was onto something wasnt he!!
Remembr to smile at every stop light your being filmed !!
Glory To The Government Comrade