Hereke Tunnel
The Hereke Tunnel (Turkish: Hereke Tüneli), is a motorway tunnel constructed on the Istanbul–Ankara motorway  O-4
 O-4  E80 in Kocaeli Province, northwestern Turkey. It was opened to traffic in 1984.
 E80 in Kocaeli Province, northwestern Turkey. It was opened to traffic in 1984.
|  Hereke Tunnel westbound   O-4. | |
| Overview | |
|---|---|
| Location | Hereke, İzmit, Kocaeli, Turkey | 
| Coordinates | 40°47′06″N 29°36′33″E   Hereke Tunnel Location of Hereke 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 | 281–285 m (922–935 ft) | 
| No. of lanes | 2 x 3 | 
| Operating speed | 80 km/h (50 mph) | 
It is situated in Körfez district of Kocaeli Province. The 281–285-metre (922–935 ft) long twin-tube tunnel carries three 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]
See also
    
    
References
    
- "Gültepe ve Korutepe Tünelleri yenileniyor". Çağdaş Kocaeli (in Turkish). 2013-12-25. Retrieved 2016-08-13.
- "Karayollarında yol yapımı ve onarım devam ediyor". Haber7.com (in Turkish). 2012-05-15. Retrieved 2016-08-13.
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