Bioaccez has built the warning system on Tingstad tunnel. It is used for self-evacuation. Tingstads is a motorway tunnel under the Göta älv. The tunnel connects Hisingen with main Gothenburg. The tunnel consists in two immersed tubes with three lanes in each tube. It is part of the E6 route linking Norway with Sweden. The tunnel has been opened to traffic since 1968. 125,000 vehicles are circulating each day consequently needs a strong renovation. SICE Nordics AB will install the tunnel warning system that certainly shall guarantee the safety at work.