[1] The tunnel is 1,650 metres (5,410 ft) long and in the shape of a helix, with six rising circles, in the same style as a multi-storey parking lot.

[2] The tunnel emerges at a summit 600 feet (180 m) above the town on Skansen Ridge,[3] where there are parking facilities and a cafe.

[1] There is a road toll levied for use of the tunnel, which for cars as of 2020 was NOK 35, paid as a parking fee at the top.

Refurbishment included numerous structural and safety improvements as well as adding coloured lighting to make the tunnel an even bigger tourist attraction.

[8] Desmond Bagley's 1973 novel The Tightrope Men features a scene where the protagonist Giles Denison drives cautiously up through the tunnel and then is pursued at speed back down it by another car.