The tunnel is 1,765 metres (5,791 ft) long and has two tubes, one for each direction of travel and each accommodating two lanes of highway.

[2] Late on Christmas Day 2006, about 200 cubic metres (7,100 cu ft) of rock fell from the ceiling of the southbound tunnel, onto the highway below.

The debris covered a 25-metre (82 ft) long stretch of road, and at places the pile was almost as high as the tunnel ceiling.

Statens Vegvesen rejects that this was a new collapse of the tunnel, declaring the episode to be a work accident.

[7] The closure of the E18 highway for tunnel repairs during the summer of 2007 lead to major traffic jams.