Mount Bolu Tunnel, Road tunnel in Kaynaşlı and tourist attraction in Bolu, Turkey.
The Mount Bolu Tunnel extends 3.1 kilometers through the mountain, featuring twin bores that each accommodate three lanes of traffic in both directions.
Construction of the tunnel began in 1993 through a Turkish-Italian partnership, with completion achieved in phases during 2007 at a cost of 300 million dollars.
The tunnel represents a major infrastructure development in Turkey, connecting the metropolitan areas of Istanbul and Ankara through the mountainous terrain.
Vehicles must maintain a maximum speed of 70 kilometers per hour inside the tunnel, and transportation of hazardous materials is not permitted.
The tunnel crosses the North Anatolian Fault line and withstood the 1999 Düzce earthquake during its construction phase, demonstrating advanced engineering capabilities.
Location: Kaynaşlı
Location: Bolu
GPS coordinates: 40.74800,31.45820
Latest update: September 23, 2025 16:44
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