construction) – 2 x 338 m İstanbul, Şile-Ağva, T3 Tunnel (under construction) – 2 x 335 m Mersin, Yenikaş-Gözce, Karadere Tunnels, T6 Tunnel (under construction) – 2 x 330 m Konya, Taşkent-Çetmi, Balcılar Tunnel (under construction) – 1 x 300 m İstanbul, Şile-Ağva, T4 Tunnel (under construction) – 2 x 267 m Antalya(Alanya), Dim-2 Tunnel (under construction) – 2 x 205 m İstanbul, Cebeci Road, Habibler Cut-Cover Tunnel (under construction) – 2 x 135 m Road tunnels (projected) Zonguldak Beltway, Gökgöl-Ilıksu Tunnel (projected) – 2 x 13,000 m Ardahan-Artvin(Şavşat), Sahara Tunnel (projected) – 2 x 12,976 m Hatay, Dörtyol-Hassa, Amanos T4 Tunnel (projected) – 2 x 12,320 m Erzurum-Tekman, Palandöken Tunnel (projected) – 2 x 12,155 m Trabzon(Çaykara)-Bayburt(Aydıntepe), Soğanlı (Soğanlıdağ) Tunnel (projected) 2 x 11,220 m Antalya, Manavgat-Akseki, Ahmetler Tunnel (projected) – 2 x 10,585 m Erzurum-İspir, Kavaklıdere Tunnel (projected) – 2 x 10,000 m Erzincan-Refahiye, Sakaltutan Tunnel (projected) – 2 x 8,780 m Van, Gevaş-Bahçesaray T1 Tunnel (projected) – 1 x 7,970 m Antalya, Finike-Demre T1 Tunnel (projected) – 2 x 7,910 m İstanbul, Sarıyer-Kilyos Tunnel (projected) – 2 x 7,025 m Kayseri(Tomarza)-Adana(Tufanbeyli), Berçin (Dede Beli) Tunnel (projected) – 2 x 6,845 m Sivas(İmranlı)-Erzincan(Refahiye), Kızıldağ Tunnel (projected) – 2 x 6,600 m Great Istanbul Tunnel, European Side Two Layered Tunnel (projected) – 2 x 6,500 m Bitlis(Tatvan)-Van(Gevaş), Yelkenli Tunnel (projected) – 2 x 6,250 m Giresun, Dereli-Şebinkarahisar, Pınarlar Tunnel (projected) – 1 x 6,011 m Gümüşhane(Kelkit)-Erzincan, Pöske (Ahmediye) Tunnel (projected) – 2 x 6,000 m Kütahya(Domaniç)-Bursa(İnegöl), Hayme Ana (Kocadağ/Kocayayla) Tunnel (projected) – 2 x 6,000 m Artvin, Borçka, Macahel (Camili) Tunnel (projected) – 1 x 5,990 m Ağrı(Doğubeyazıt)-Van(Çaldıran), Tendürek Tunnel (projected) – 2 x 5,500 m Giresun Ring Road, Gülyalı-Keşap T16 Tunnel (projected) –2 x 5,387 m Antalya, Manavgat-Akseki, Karpuzçay-2 Tunnel (projected) – 2 x 4,920 m Afyonkarahisar, İscehisar-Bayat, Köroğlubeli Tunnel (projected) – 2 x 4,825 m Tokat-Sivas(Yıldızeli), Çamlıbel Tunnel (projected) – 2 x 4,700 m Giresun Ring Road, Gülyalı-Keşap T19 Tunnel (projected) – 2 x 4,652 m Erzurum-Pasinler, Nenehatun Tunnel (projected) – 2 x 4,600 m Hatay, Dörtyol-Hassa, Amanos T1 Tunnel (projected) – 2 x 4,560 m Great Istanbul Tunnel, Asian Side Two Layered Tunnel (projected) – 2 x 4,400 m Bolu(Mudurnu)-Sakarya(Akyazı), Hodan (T2) Tunnel (projected) – 2 x 4,370 m Sivas(Gürün)-Kayseri(Pınarbaşı), Mazıkıran Tunnel (projected) – 2 x 4,200 m Fatsa Beltway, T1 Tunnel (projected) – 2 x 4,060 m Gümüşhane(Kürtün)-Trabzon(Tonya), T4 Tunnel (projected) – 1 x 3,630