Turkish State Highway System

The State Highways of the Republic of Turkey (Turkish: Türkiye Cumhuriyeti Devlet Karayolları), abbreviated as T.C.K. are an integrated network of highways and roads in Turkey, consisting of a numbered grid spanning across the country. They are more commonly called State roads (Turkish: Devlet yolu) and are the primary road network in Turkey. The network is mostly maintained by the General Directorate of Highways (KGM), except for within large cities (Turkish: Büyükşehir) where the respective city municipality assumes responsibility.

In the early 21st century, the network was greatly expanded to accommodate four-lane highways throughout the country. As of 2021, 19,790 km (12,300 mi) of the total 30,974 km (19,246 mi) system are four-lane highways.