The Sonnenberg Tunnel is a 1,550 m long motorway tunnel, constructed between 1971 and 1976 and located in Lucerne, Switzerland. At its completion it was also the world's largest civilian nuclear fallout shelter, designed to protect 20,000 civilians in the eventuality of war or disaster.
The A2 motorway from Chiasso to Basel passes through the tunnel and carries around 55,000 vehicles a day. There are tentative plans to construct a bypass to replace the section of the motorway that leads through Lucerne, which includes the Sonnenberg and Reussport tunnels.
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Address: Luzern, Switzerland
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