Automatic vehicle identification as a traffic management measure.

The use of automatic vehicle identification and monitoring (AVI) /AVM) as a traffic management measure is reviewed. The technologies employed in AVI /AVM are discussed. AVM using transponders is a simple and practical method for vehicle identification and the implementation of an AVM system for electronic road pricing in Hong Kong is reported. It is argued that fitting transponders to private vehicles for the purpose of traffic management may not be politically or socially acceptable.