The Korutepe Tunnel (Turkish: Korutepe Tüneli), is a motorway tunnel constructed on the Istanbul–Ankara motorway O-4 E80 in Kocaeli Province, northwestern Turkey.

It is situated on the Korutepe Hill west of İzmit.

The 1,028–1,088-metre (3,373–3,570 ft) long twin-tube tunnel carries two lanes of traffic in each direction.

[2] In the time period of 2013–2014, the tunnel was modernized for traffic safety.

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