Turkish State Highway System
The State Highways of the Republic of Turkey (Turkish: Türkiye Cumhuriyeti Devlet Yolları) 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.
Source: Wikipedia — Turkish State Highway System (CC BY-SA 4.0)