Mount Bolu Tunnel

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.[1]

Mount Bolu Tunnel
Overview
LocationMount Bolu
Coordinates40.74596°N 31.45523°E / 40.74596; 31.45523
Mt. Bolu Tunnel
Mt. Bolu Tunnel (Turkey)
Route O-4 / E80
StartKaynaşlı, Düzce
EndYumrukaya, Bolu
Operation
Work begun1993
Opened2007 (2007)
OperatorGeneral Directorate of Highways
Trafficautomotive
Technical
Length3,014 m (9,888 ft) (east bound)
3,125 m (10,253 ft) (west bound)
No. of lanes2 x 3
Operating speed70 km/h (43 mph)
Highest elevation860 m (2,820 ft)
Lowest elevation810 m (2,660 ft)
Width2 x 17 m (56 ft)
Grade1,7%

Construction

The tunnel is part of the Gümüşova-Gerede Highway O-4 / E80 within the Trans-European Motorway project, which was carried out by the Turkish Bayındır and Italian Astaldi joint venture since April 16, 1993.[2] 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.

The tunnel crosses the North Anatolian Fault. The November 12, 1999 Düzce earthquake (MW=7.2) caused substantial damage to the tunnel and viaducts, which were under construction at the time of the earthquake.[2]

On September 4, 2005 the excavation of the tunnel in the Istanbul-Ankara direction was finished. The excavation for the tunnel in the Ankara-Istanbul direction was completed by the beginning of August 2005.

Opening to traffic

The Istanbul-Ankara direction (3,014 m (9,888 ft)) was opened to traffic on January 23, 2007 by the Turkish Prime Minister Recep Tayyip Erdoğan and Italian Prime Minister Romano Prodi.[2] Four months following the initial opening, on May 7, the Ankara-Istanbul direction (3,125 m (10,253 ft)) became operational.[3][4]

Speed in the tunnel is limited to 70 km/h (43 mph).[5] Dangerous goods carriers are not permitted to use the tunnel.[6]

gollark: The update system is quite efficient and only downloads changed files, but most of the code is in one giant 200KB bundle.
gollark: The update system is quite efficient and only downloads changed files, but most of the code is in one giant 200KB bundle.
gollark: The update system is quite efficient and only downloads changed files, but most of the code is in one giant 200KB bundle.
gollark: The update system is quite efficient and only downloads changed files, but most of the code is in one giant 200KB bundle.
gollark: The update system is quite efficient and only downloads changed files, but most of the code is in one giant 200KB bundle.

See also

References
  1. "Bolu Dağı Tüneli yarın açılıyor". Sabah (in Turkish). 2007-01-22. Retrieved 2011-02-13.
  2. "Bolu Tüneli 14 yıl sonra açıldı". NTV MSNBC (in Turkish). 2007-01-24. Retrieved 2011-02-13.
  3. "Bolu Tüneli'nde ikinci tüp hizmete açıldı". NTV MSNBC (in Turkish). 2009-05-09. Retrieved 2011-02-13.
  4. "Tünneler". Karayolları Genel Müdürlüğü. Retrieved 2014-04-20.
  5. Toydemir, Ali (2009-02-10). "Bolu Tüneli'nde ölüm oyunu". Hürriyet (in Turkish). Retrieved 2011-02-13.
  6. "Tehlikeli Maddelerin Taşınmasına İzin Verilmeyen Otoyol Tünelleri" (PDF) (in Turkish). Karayolları Genel Müdürlüğü. Retrieved 2016-08-14.

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