Tingstadstunneln

Tingstadstunneln is a motorway tunnel under the Göta älv, connecting Hisingen with mainland Gothenburg. The tunnel was constructed with two parallel immersed tubes with three lanes of traffic in each tube. It is part of the E6 route linking Norway with south-west Sweden.
Construction started on 17January 1961, and the tunnel was inaugurated at 11:30 am on 29March 1968.
The tunnel has the lowest motorway elevation in Sweden, at below sea level.
The tunnel had severe traffic congestion problems for several years. A new tunnel was for this reason built a little farther north, Marieholmstunneln, which was opened in 2020. The Tingstad Tunnel is after this mainly used for traffic along road E6, while Marieholmstunneln is used for those who want to diverge to the connecting roads E20, E45 or 155.