The work comprises both building, construction and electrical disciplines.
The Ellingsøy and Valderøy tunnels were renovated in 2008-2009. The tunnel works here mainly comprises the upgrading of electro technical installations and safety equipment. 7 new niches shall be blasted in the tunnels for new breakdown laybys and technical rooms. There is also a lot of work that shall be carried out in the Flatholmen tunnel ramps, which have not been previously upgraded.
The existing electro technical installations, safety equipment and water and frost protection shall be demolished and removed in the Godøy tunnel and new installations shall be established. 3 new niches shall be blasted for breakdown lay-bys and a technical room. A guardrail shall be cast on both sides for almost the entire length of the tunnel.