Electronic license plate
Encyclopedia
An electronic license plate is one that emits signals identifying the vehicle
Vehicle
A vehicle is a device that is designed or used to transport people or cargo. Most often vehicles are manufactured, such as bicycles, cars, motorcycles, trains, ships, boats, and aircraft....

. Several patent
Patent
A patent is a form of intellectual property. It consists of a set of exclusive rights granted by a sovereign state to an inventor or their assignee for a limited period of time in exchange for the public disclosure of an invention....

s have been issued pertaining to such plates. However, despite their lengthy test period, they have been little-deployed. It was argued by John Semmens, research project manager in the Arizona Department of Transportation
Arizona Department of Transportation
The Arizona Department of Transportation is an Arizona state government agency charged with facilitating mobility within the state. In addition to managing the state's highway system, the agency is also involved with public transportation and municipal airports...

Research Center, that the electronic license plate could be very useful in facilitating privatization of vehicle licensing.
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