OGS (electronic toll collection)

OGS, acronym for Otomatik Geçis Sistemi (literally: Automatic Pass System), is an electronic toll collection system of radio-frequency identification (RFID) transponder type available on toll roads and toll bridges in Turkey. The system was adopted to avoid traffic congestion at toll plazas. An alternative to OGS is the KGS system of smart card type implemented later on at the same toll plazas.

It was launched in 1998, and was first installed on the Fatih Sultan Mehmet Bridge at over Bosporus in Istanbul. The OGS was later extended to the intercity motorways , , , and and the other toll bridge Bosphorus Bridge on over the Istanbul Strait. Currently, the OGS is in use on all toll roads in the country. The system is administrated by the General Directorate of Highways (Turkish: TC Karayolları Genel Müdürlüğü, KGM).