Mount Bolu Tunnel

Mount Bolu Tunnel

Overview
Location	Mount Bolu
Coordinates	40°44′45″N 31°27′19″E / 40.74596°N 31.45523°E / 40.74596; 31.45523Coordinates: 40°44′45″N 31°27′19″E / 40.74596°N 31.45523°E / 40.74596; 31.45523 Mt. Bolu Tunnel Mt. Bolu Tunnel (Turkey)
Route
Start	Kaynaşlı, Düzce
End	Yumrukaya, Bolu
Operation
Work begun	1993
Opened	2007; 10 years ago (2007)
Operator	General Directorate of Highways
Traffic	automotive
Technical
Length	3,014 m (9,888 ft) (east bound) 3,125 m (10,253 ft) (west bound)
No. of lanes	2 x 3
Operating speed	70 km/h (43 mph)
Highest elevation	860 m (2,820 ft)
Lowest elevation	810 m (2,660 ft)
Width	2 x 17 m (56 ft)
Grade	1,7%

40°44′45″N 31°27′19″E / 40.74596°N 31.45523°E / 40.74596; 31.45523Coordinates: 40°44′45″N 31°27′19″E / 40.74596°N 31.45523°E / 40.74596; 31.45523

Mount Bolu Tunnel (Turkish: Bolu Dağı Tüneli) is a 3.1-kilometre-long (1.9 mi) highway tunnel constructed through the Bolu Mountain in Turkey between Kaynaşlı, Düzce and Yumrukaya, Bolu.

The tunnel is part of the Gümüşova-Gerede Highway within the Trans-European Motorway project, which was carried out by the Turkish Bayındır and Italian Astaldi joint venture since April 16, 1993. The total cost of the tunnel is about US$300 million. It has twin 17-metre-wide (56 ft) bores carrying three lanes of traffic in each direction.