Autopass is an 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 used in Norway

Norway

Norway , officially the Kingdom of Norway, is a Nordic unitary constitutional monarchy whose territory comprises the western portion of the Scandinavian Peninsula, Jan Mayen, and the Arctic archipelago of Svalbard and Bouvet Island. Norway has a total area of and a population of about 4.9 million...

. It allows collecting road tolls automatically from cars. It uses electronic radio

Radio

Radio is the transmission of signals through free space by modulation of electromagnetic waves with frequencies below those of visible light. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space...

 transmitters and receivers operating at 5.8 GHz (MD5885) supplied by the Norwegian companies Q-Free

Q-Free

Q-Free ASA is an electronic toll collection technology development company based in Trondheim, Norway. The company delivers systems for toll collection and automated ticketing globally and is listed on the Oslo Stock Exchange.-History:...

 and Fenrits.
The system involves the installation of a DSRC based radio transponder

Transponder

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

 on the windscreen of a vehicle, and to sign an agreement with one of the toll collection companies in Norway.