County road 48 Fossenbratte tunnel – upgrading of tunnels

The Fossenbratte tunnel shall be upgraded in accordance with the County Road Tunnel Safety Regulations. The tunnel is located on county road 49 in Samnanger municipality, between Eikedalen and Bjørkheim. The tunnel has a length of 665 metres and one annual daily traffic (ÅDT) of 2831 vehicles (2023), of which 15% are heavy transport. It is classified in tunnel class B, signposted height 4.2 metres. The speed limit in the tunnel is 80 km/h. It has approx. 6% falls in the direction of Bjørkheim. The tunnel was opened to traffic in 1976.

The upgrading mainly includes replacing and modernising electrical and technical control installations, the establishment of a new technical building in the open air, a new drainage and surface water system, as well as new railings both in the tunnel and in the open air zone. The completed upgraded tunnel shall have a lane width of 3.10 metres and the sign height of 4.2 metres, as well as the shoulder against the guide edge shall be 0.5 metres.
The tender documentation is prepared as a model based basis with supplementary drawings.

See also the tender documentation