Gültepe Tunnel
From Wikipedia, the free encyclopedia
The Gültepe Tunnel (Turkish: Gültepe Tüneli), is a motorway tunnel constructed on the Istanbul–Ankara motorway 
O-4 
E80 in Kocaeli Province, northwestern Turkey. It was opened to traffic in 1984.
 Gültepe Tunnel westbound O-4. | |
| Overview | |
|---|---|
| Location | Gültepe, İzmit, Kocaeli, Turkey |
| Coordinates | 40°46′32″N 29°54′30″E
  Gültepe Tunnel Location of Gültepe Tunnel in Turkey |
| Status | Operational |
| Route | O-4 E80 |
| Operation | |
| Opened | 1984 |
| Operator | General Directorate of Highways |
| Traffic | automotive |
| Vehicles per day | ca. 55,000 |
| Technical | |
| Length | 639–584 m (2,096–1,916 ft) |
| No. of lanes | 2 x 2 |
| Operating speed | 80 km/h (50 mph) |
It is situated on the Gültepe Hill west of İzmit. The 639–584-metre (2,096–1,916 ft) long twin-tube tunnel carries two lanes of traffic in each direction.
The tunnel was constructed in the 1980s. During the 1999 İzmit earthquake, the tunnel was light damaged.[1] In 2012, the tunnel's both tubes were reinforced.[2] In the time period of 2013–2014, the tunnel was modernized for traffic safety. Around 55,000 vehicles pass through the tunnel in both directions daily.[1]
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