Skanska

The Lærdal Tunnel is the world's longest road tunnel at 24.5 kilometres and a key transport corridor between eastern and western Norway. The upgrade will improve safety, reliability and technical systems, ensuring continued efficient traffic flow between Oslo and Bergen.

The project comprises extensive rehabilitation works and upgrades to technical and safety systems. The work will be carried out while the tunnel remains largely open to traffic, requiring careful planning and logistics.

Construction is scheduled to commence in November 2026, with completion planned for 2029.