Smart Tag is the former name of a transponder

Transponder

In telecommunication, the term transponder has the following meanings:...

-based electronic toll collection

Electronic toll collection

Electronic toll collection , an adaptation of military "identification friend or foe" technology, aims to eliminate the delay on toll roads by collecting tolls electronically. It is thus a technological implementation of a road pricing concept...

 system implemented by the Virginia Department of Transportation

Virginia Department of Transportation

The Virginia Department of Transportation is the agency of state government responsible for transportation in the state of Virginia in the United States. Headquartered in Downtown Richmond, VDOT is responsible for building, maintaining, and operating the roads, bridges and tunnels in the...

 (VDOT). It was launched as Fastoll on April 15, 1996. Fastoll was rebranded as Smart Tag in 1998, and was placed under the umbrella of Smart Travel. In November 2007, the Smart Tag brand name was retired in favor of E-ZPass Virginia, several years after the Smart Tag system became a part of the E-ZPass

E-ZPass

E-ZPass is an electronic toll-collection system used on most tolled roads, bridges, and tunnels in the northeastern US, south to Virginia and West Virginia, and west to Illinois. Currently, there are 25 agencies spread across 14 states that make up the . All member agencies use the same technology,...

 network.

Originally, Smart Tag only operated at certain toll roads and crossings in Virginia.