Tags: Road Tunnel.

The Oslofjord Tunnel (Norwegian: Oslofjordtunnelen) is a subsea road tunnel which traverses the Oslofjord connecting Hurum and Frogn in Norway. Carrying three lanes National Road 23 the 7306-meter (23970 ft) long tunnel reaches a depth of 134 meters (440 ft) below mean sea level. The tunnel has a maximum gradient of seven percent.

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