Kozbükü Tunnel

Kozbükü Tunnel (Turkish: Kozbükü Tüneli), is a highway tunnel constructed in Ordu Province, northern Turkey.

Kozbükü Tunnel is part of the Samsun-Ordu Highway within the Black Sea Coastal Highway, of which construction was carried out by the Turkish Nurol-Tekfen-Yüksel joint venture. The 261 and 257 m (856 and 843 ft)-long twin-tube tunnel carrying two lanes of traffic in each direction is flanked by 116–150 m (381–492 ft)-long Kadıoğlu Tunnel in the west and 170–135 m (558–443 ft)-long Tekkebak Tunnel in the east on the same highway.

The tunnel was opened to traffic on April 7, 2007 by Turkish Prime Minister Recep Tayyip Erdoğan. Dangerous goods carriers are not permitted to use the tunnel.