The British government is preparing to test new high-tech license plates containing microchips capable of transmitting unique vehicle identification numbers and other data to readers more than 300 feet away.
This is a good idea though I'm not too gone on the idea of the RFID tag being in the license plate, everyone knows people who had their license plate stolen, or broken in little fender bender accidents. Maybe the tags could be physically attached to the car in the trunk or around the engine block? Either way it could make law enforcement, congestion charging and maybe even locating stolen cars a lot easier. There are privacy issues, but I think people would get used to this and eventually see them as little more than digital license plates.