T5 Motorway Tunnel – 2 x 1,475 m KMO 5. Section, Kocaeli T1 Motorway Tunnel – 2 x 1,405 m Bursa, Selçukgazi Motorway Tunnel – 2 x 1,303 m Gaziantep(Nurdağı), Aslanlı Motorway Tunnel – 2 x 1,230 m Kocaeli, Korutepe Motorway Tunnel – 2 x 1,088 m Niğde-Adana, Kırkgeçit-1 Motorway Tunnel – 2 x 958 m İzmir, Menemen-Çandarlı, Buruncuk Motorway Tunnel – 2 x 946 m Niğde-Adana, Kırkgeçit-6 Motorway Tunnel – 2 x 855 m İstanbul, Riva Motorway Tunnel – 2 x 782 m İstanbul, Çamlık Motorway Tunnel – 2 x 653 m Niğde-Adana, Kırkgeçit-5 Motorway Tunnel – 2 x 652 m Kocaeli, Gültepe Motorway Tunnel – 2 x 639 m Niğde-Adana, Kırkgeçit-4 Motorway Tunnel – 2 x 630 m Osmaniye(Bahçe), Ayran Motorway Tunnel – 2 x 596 m İstanbul, Çatalca-2 Motorway Tunnel – 2 x 593 m Niğde-Adana, Kırkgeçit-2 Motorway Tunnel - 2 x 584 m Niğde-Adana, Kırkgeçit-7 Motorway Tunnel – 2 x 534 m Bursa(Gürsu), İğdir Motorway Tunnel – 2 x 518 m Adana(Pozantı), Çakıt Motorway Tunnel – 2 x 497 m Kocaeli, İzmit West Motorway Tunnel – 2 x 435 m Osmaniye(Bahçe), Taşoluk Motorway Tunnel – 2 x 376 m KMO 5. Section, Kocaeli T3 Motorway Tunnel – 2 x 371 m İzmir, Bayraklı-1 Motorway Tunnel – 2 x 320 m İstanbul, Harp Akademileri Motorway Tunnel – 2 x 315 m Adana, Fehmi Özeltürkay (Mahfesığmaz) Cut-Cover Motorway Tunnel – 2 x 300 m Niğde-Adana, Kırkgeçit-3 Motorway Tunnel – 2 x 286 m Kocaeli, Hereke Motorway Tunnel – 2 x 285 m Kocaeli, Diliskelesi (Dilovası/Dilderesi) Motorway Tunnel – 2 x 220 m Adana, Gülek Motorway Tunnel – 2 x 200 m Hatay, İskenderun Motorway Tunnel – 2 x 200 m Motorway tunnels (under construction) Motorway tunnels (projected) Yalova-İzmit Motorway, Yalova-Elmalık, T1 Motorway Tunnel (projected) – 2 x 942 m Yalova-İzmit Motorway, Yalova-Elmalık, T2 Motorway Tunnel (projected) – 2 x 1,045 m Yalova-İzmit Motorway, Çukurköy-Gölcük, T1 Motorway Tunnel (projected) – 2 x 480 m Yalova-İzmit Motorway, Çukurköy-Gölcük, T2 Motorway Tunnel (projected) – 2 x 880 m Yalova-İzmit Motorway, Çukurköy-Gölcük, T3 Motorway Tunnel (projected) – 2 x 1,560 m Yalova-İzmit Motorway, Çukurköy-Gölcük, T4 Motorway Tunnel (projected) – 2 x 3,730 m Yalova-İzmit Motorway, Gölcük-Bahçecik, T5 Motorway Tunnel (projected) – 2 x 830 m Yalova-İzmit Motorway, Bahçecik-Karatepe, T6 Motorway Tunnel (projected) – 2 x 3,155 m Kınalı-Balıkesir Motorway, Çorlu Cut-Cover T1 Motorway Tunnel (projected) – 2 x 500 m Kınalı-Balıkesir Motorway,