U.K. Testing "E-Plates"

The United Kingdom government is testing “e-plates” to identify vehicles instantaneously. E-plates use embedded, battery-powered radio frequency identification (RFID) tags to positively identify any vehicle, anywhere stationary or mobile, anytime and in all weather.

E-plates are the same size and shape as conventional plates and are permanently fitted to a vehicle. Each e-plate contains a unique encrypted identification number, which the tag transmits for detection by RFID readers. Multiple tags can be read simultaneously by a single RFID reader at speeds of up to 200mph and up to 300 feet away.