The tunnel was blasted through solid rock and opened to the public in 1961 after being inaugurated by King Olav V.
The total length of the internal spiral tunnel is 1,650 meters.
The structure reaches an altitude of 213 meters above sea level, providing a panoramic view of the Drammen river basin.
The road consists of six distinct full-circle turns inside the mountain.
The entrance to the tunnel is located at an altitude of approximately 50 meters above sea level.
The summit plateau houses the Spiraltoppen restaurant, which is built on the site of the former quarry operations.
The Drammen Spiral is a unique road tunnel that ascends 1,650 meters inside the Bragernesåsen hillside via six consecutive loops. Constructed within a former granite quarry, the tunnel reaches an elevation of 213 meters above sea level at the summit. At the tunnel exit, visitors reach a plateau featuring a restaurant, a viewpoint overlooking the Drammen valley, and access to the Bragernesåsen trail network. The tunnel interior is illuminated and follows a corkscrew design to overcome the steep incline of the mountain. It serves both as a functional road for vehicles and as a tourist attraction providing a vantage point for the city and the Drammen River.
The viewing platform at the summit plateau adjacent to the Spiraltoppen restaurant.
Drive slowly to fully experience the spiral geometry and look for the rock markings inside.
Pack a windbreaker as it can be significantly cooler and windier at the summit plateau than in the city center.
Visit the connecting trail network in the forest if you plan to walk after driving up.
Attempting to cycle or walk through the tunnel itself, as it is primarily a narrow road for motorized vehicles.
The road is typically closed during the winter season due to snow and ice conditions.
