With a diameter of 15 metres, the third tube on the Gubrist is currently the largest tunnel in Switzerland. Three kilometres of rock still have to be cut through before the core section is continuous to relieve the most polluted section of the Swiss motorway. The construction of the third Gubrist Tunnel tube is of great interest to the Swiss public. For capacity and safety reasons, site visits by local residents and other interested parties are not possible.
For this reason, the Swiss Federal Roads Office (FEDRO) organised an open construction site day for the second time to help citizens get a wider understanding of the major project taking place.
On Saturday, 26 May 2018, between 10 a.m. and 4 p.m., around 2,500 visitors visited the construction site “A1 northern Zurich bypass”. Since November, the main work on the third Gubrist tube has been underway – therefore the tunnel was the focus of this year’s event. At five different locations, the information pavilion, the installation site, the tunnel portal, the tunnel face and the loading station, representatives from the Road Infrastructure Division’s Winterthur office as well as planners and site managers provided an insight into the large-scale project.