Tunnel rush slope4/8/2023 The tunnel is built with continual concrete elements to ensure better protection against water leaks. It can also be used as a water source for the fire department. There is a natural reservoir under the tunnel able to retain 5,000 cubic meters (180,000 cu ft) of water, which can act as a buffer. To handle this a pump system is installed capable of draining 4,000 litres (880 imp gal 1,100 US gal) per minute. There is a natural flow of 1,800 litres (400 imp gal 480 US gal) of sea- and ground water into the tunnel every minute. These can be sealed off from the main tunnel and can each provide pressurized space for thirty to fifty people while a fire is being fought. The tunnel is equipped with 25 evacuation rooms. In an effort to eliminate the problem, the Public Roads Administration has proposed building a second tube. After the latter incident, the tunnel has been closed for heavy traffic exceeding 7.5 tonnes. There have been two major truck fires, one in 2006 and one in 2011. All of these incidents resulted in the tunnel being closed for weeks. The tunnel was flooded in 20 and experienced a landslide in 2003. Since 30 August 2016, it is free to pass through the tunnel. In 2014, the manual toll station was replaced by an automatic station. ![]() The tunnel was official opened on 29 June 2000 and was financed in part by a toll, collected by Bompengeselskapet Oslofjordtunnelen at a toll plaza in Frogn. Parliament gave approval on 13 December 1996 and construction started on 14 April 1997. ![]() Even though Gardermoen was ultimately built as the airport, the tunnel had raised sufficient support to be built irrespectively. Plans resurfaced in the early 1980s with the advent of subsea tunneling technology and the Oslo Airport location controversy, which proposed airports in Hurum, Ås and Hobøl. Plans for a fixed link were launched in 1963, originally based on two bridges which would connect to Håøya. ![]() The crossing was originally served by the Drøbak–Storsand Ferry, which commenced in 1939. The tunnel is since 2018 a part of European route E134, until 2018 it was part of National Road 23. It acts as the main link connecting eastern and western Viken county, supplementing the Moss–Horten Ferry which runs further south. The tunnel has a maximum gradient of seven percent. Carrying three lanes, the 7,306-meter (23,970 ft) long tunnel reaches a depth of 134 meters (440 ft) below mean sea level. The Oslofjord Tunnel ( Norwegian: Oslofjordtunnelen) is a subsea road tunnel which traverses the Oslofjord, connecting Hurum and Frogn in Norway.
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