The Eurasia Tunnel Project (Istanbul Strait Road Tube Crossing Project) connects the Asian and European sides of the city via a highway tunnel crossing underneath the seafloor. The Eurasia Tunnel, between traffic-dense Kazlıçeşme and Göztepe, covers a route of 14.6 kilometers.
While the 5.4-kilometer section of the Project consists of a twin-deck tunnel under the seafloor built with special technology and connection tunnels, a total of 9.2-kilometer routes on both the Asian and European sides includes road expansion and improvement works. The approach roads between Sarayburnu-Kazlıçeşme and Harem-Göztepe were expanded and intersections, vehicle underpasses and pedestrian overpasses were constructed.