A plan in Massachusetts to use GPS chips for monitoring the number of miles residents drive has some worried "big brother" is about to track their every move.

Supporters say the chips used in the "Vehicle Miles Traveled" program won't be used to track drivers in real time.

Instead, the chips will send signals to a satellite on how many miles people drive in the state. The state would then use the information to tax drivers based on their mileage.

The new tax would make up for lost gas tax revenues that are expected to drop as more fuel efficient cars are built. The federal government is also considering chipping cars.

A similar program has been used in Oregon. Rhode Island and Idaho are also considering the chips.

The plan has not been enacted yet, though the Governor of Massachusetts wants to put a GPS chip in every car in the state.