Work on several stretches of the A8 in the Bernese Oberland region

The main focus of the “Bernese Oberland Tunnel Safety” programme will be on the stretch of the A8 between Interlaken-Ost and Brienz. As part of a comprehensive maintenance project, tunnels along this stretch are to be renovated and equipped with emergency galleries, and renovation work is also planned for other stretches.

Construction of safety gallery in the Giessbach tunnel

In an initial stage, the three tunnels on the left-hand side of Lake Brienz have been equipped with additional galleries in a project to be implemented between 2014 and 2018. A safety gallery running parallel to the main tube has been constructed in the 3.3−kilometre Giessbach tunnel and the 1.3−kilometre Chüebalm tunnel, while the relatively short Sengg tunnel (0.9 kilometres) has been equipped with an escape gallery leading laterally from the centre of the tunnel to the exterior.

The maintenance project itself will start in 2020. One of the main focuses of this project is the renovation of the longest tunnel in the Bernese Oberland, namely the Giessbach. Here, the existing ventilation system has to be brought into line with the latest requirements. Other measures will include the renovation of bridges and other engineering structures, as well as road surfaces.

Work on the Interlaken-Ost to Brienz stretch of the A8 will be highly intensive. However, the fact that construction work will primarily be carried out at night will ensure that that the impacts on daily traffic flow will be kept to a minimum.

In addition to the stretch along the shore of Lake Brienz, the “Bernese Oberland Tunnel Safety” programme encompasses various other elements. The tunnels on the A8 in Leissigen and Brienzwiler (Soliwald tunnel) are also to be equipped with emergency galleries. An Escape gallery for the Simmenfluh tunnel has already been constructed, and various safety measures for the Lütschinen underpass and the Rugen tunnel have been taken.