Tingstadstunneln is a motorway tunnel under the Göta Älv

Göta älv

The Göta is a river that drains lake Vänern into the Kattegat at the city of Gothenburg on the western coast of Sweden. It is located in Götaland, with the river itself being a site of early Geatish settlement. The length is 93 km. Often the combination of Göta älv and Klarälven is mentioned...

, connecting Hisingen

Hisingen

Hisingen is the fourth-largest island of Sweden , with an area of , and the most populous, forming part of Gothenburg Municipality, Västra Götaland County. It is bordered by the Göta älv in the south and east, the Nordre älv in the north, and the Kattegat in the west...

 with mainland Gothenburg

Gothenburg

Gothenburg is the second-largest city in Sweden and the fifth-largest in the Nordic countries. Situated on the west coast of Sweden, the city proper has a population of 519,399, with 549,839 in the urban area and total of 937,015 inhabitants in the metropolitan area...

. The tunnel was constructed with two parallel immersed tube

Immersed tube

An immersed tube is a kind of underwater tunnel composed of segments, constructed elsewhere and floated to the tunnel site to be sunk into place and then linked together. They are commonly used for road and rail crossings of rivers, estuaries and sea channels/harbours...

s with three lanes of traffic in each tube. It is part of the E6

European route E6

European route E 6 is the designation for the main north-south road in Norway, and the west coast of Sweden, running from the southern tip of Sweden, at Trelleborg, into Norway and through almost all of the country north to Finnmark. The route ends close to the Norwegian border with Russia...

route linking Norway with south-west Sweden.

Construction started on January 17, 1961, and the tunnel was inaugurated at 11:30 am on March 29, 1968.

The tunnel has the lowest motorway elevation in Sweden, at 15 meters below sea level.