State road D.100 (Turkey)

State road D.100 is a major west-east highway in Turkey. It serves as a crucial transportation artery, connecting important urban centers and regions across the country. The D.100 runs roughly parallel to the northern coastline of Turkey, though it often deviates inland. It is part of the international E80 highway, forming a significant section of the Trans-European Motorway network.

The highway's route traverses diverse geographical landscapes, including coastal areas, mountainous terrains, and plains. The D.100 passes through or near major cities such as Istanbul, İzmit, Adapazarı, Bolu, Ankara, Kırıkkale, Sivas, Erzincan, and Erzurum, facilitating the movement of goods and people between these key economic hubs.

The D.100 is typically a multi-lane divided highway in its most heavily trafficked sections, especially near large cities. In other areas, it may consist of two lanes. The quality of the road surface and infrastructure varies along its considerable length.

Due to its importance for transportation and logistics, the D.100 experiences heavy traffic volume, particularly in the vicinities of major urban centers. It serves as a primary route for both passenger vehicles and commercial trucks, contributing significantly to Turkey's economic activity. The highway is subject to ongoing maintenance and upgrades to improve its capacity and safety.