AVI systems permit individual vehicles to be uniquely identified as they pass though a detection area. A roadside communications unit broadcasts an interrogation signal from its antenna. When an AVI-equipped vehicle comes within range of the antenna, a transponder (or tag) in the vehicle returns that vehicle's identification number to the roadside unit. The information is then transmitted to a central computer where it is processed. The most common application of AVI technology is for automatically collecting tolls on tollways.
Automatic Vehicle Identification. A system which combines an on-board tag or transponder with roadside receiver for the automated identification of vehicles. Used for electronic toll collection, stolen vehicle recovery, using vehicles as traffic probes, etc.
A system which transmits signals from an on-board tag or transponder to roadside receivers for uses such as electronic toll collection (ETC) and stolen vehicle recovery