Main Street Tunnel technique, whereby the tunnel was excavated, the concrete poured, and the structure buried, on top of which the canal channel was built. This avoided costly boring beneath an active waterway; the structure cost C$11 million. This price was split 50–50 between Transport Canada and the St. Lawrence Seaway Authority. The tunnel opened with a parade featuring the Welland Police pipe band and various officials on the morning of May 20, 1972. 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
Domain Tunnel speed limit applies and normal radio broadcast is regularly interrupted by announcements. Domain Tunnel The Domain Tunnel is a road tunnel located in Melbourne, Australia, which carries traffic westbound from the Monash Freeway to the West Gate Freeway, running under the Yarra River and Kings Domain. The tunnel is part of the CityLink Tollway operated by Transurban and provides a bypass of the central business district. The tunnel was constructed between 1996 and 1999 by Transfield-Obayashi Joint Venture. It was officially opened to traffic on 16 April 2000 with a temporary 60 km/h speed limit, and was free to use