Kerenzerberg Tunnel
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The Kerenzerberg Tunnel is a motorway tunnel in Switzerland, and forms part of the A3 motorway from Basel to Sargans. The tunnel is approximately 6.8 km long and it lies southwest of Lake Walen.
The Kerenzerberg Tunnel is a one-way, unidirectional tunnel. Traffic from Zurich to Sargans must pass through the Kerenzerberg Tunnel. Six tunnels lie along the motorway for traffic heading in the opposite direction. Transportation of dangerous goods through the tunnel is prohibited.