Main Street Tunnel Main Street Tunnel The Main Street Tunnel, located in Welland, Ontario, Canada, is an underwater tunnel, carrying Niagara Road 27 and the unsigned designation of Highway 7146 under the Welland Canal. It is named as a part of East Main Street. The structure was built as a part of the Welland By-Pass project. Its construction was relatively easy since, like the Townline Tunnel, it was constructed at the same time as the channel above it and a simple cut and cover. The tunnel was officially opened on May 20, 1972. The tunnel links Highway 406 on the west side of
Byfjord Tunnel at its lowest point. The tunnel held the distinction of being Europe's longest and the world's deepest tunnel upon its completion, it was surpassed by a deeper tunnel in 1994 and a longer tunnel in 1999. The tunnel had an average daily traffic of 9,675 vehicles in 2015. Byfjord Tunnel The Byfjord Tunnel () is a subsea road tunnel in Rogaland county, Norway. The long tunnel runs between Grødem on the mainland in Randaberg and the island of Sokn in Rennesøy municipality, running underneath the Byfjorden. The tunnel was built as part of the Rennesøy Fixed Link project which opened