The longest cantilevered roof in the world. When the first bridge was completed in 1958 it was the longest cantilever bridge in the world, carrying two lanes of traffic in each direction. Completed cantilever bridges. Longest Cantilever Bridge Span: The Quebec Bridge, Quebec Credit: Design Pics Inc. / Alamy. The simple cantilever bridge is 1,800 feet (549 m) long. It is the world's longest cantilever bridge, with 549 metres of clear span between its main pillars; it exceeds the Firth of Forth Bridge near Edinburgh, Scotland, by 28 metres. As of 2010, the Quebec Bridge in Canada holds the record for the longest single cantilever span. A cantilever bridge is a bridge built using cantilevers, structures that project horizontally into space, supported on only one end.For small footbridges, the cantilevers may be simple beams; however, large cantilever bridges designed to handle road or rail traffic use trusses built from structural steel, or box girders built from prestressed concrete. The bridge comprises of 14 lanes, including eight on the upper deck and six on the lower deck. Flickr.com / shelgerarad. It would bridge the St Lawrence River approximately 14 km (9 miles) North of Quebec connecting into the Grand Trunk rail line. Completed cantilever bridges Edit This list only includes bridges that carry automobiles or trains. Cantilever bridges have multiple cantilever spans and can be immediately started from all the columns . Firth of Forth Bridge. Cantilever bridges are suitable for the longest span. A cantilever bridge is a bridge built using cantilevers: structures that project horizontally into space, supported on only one end. Othmar H. Ammann provided the design, while Cass Gilbert served as the architect. The bridge was rebuilt and expanded in the 1980s, and the project was completed in 1989. The world’s longest cantilever road bridges. In Scotland, the Forth Bridge is another famous cantilever bridge. This list of cantilever bridges ranks the world's cantilever bridges by the length of their main span. 6 – Forth Bridge (Length: 2,512m – 8,241ft) Wiki Info: The Forth Bridge is a cantilever railway bridge across the Firth of Forth in the east of Scotland, 9 miles (14 kilometres) west of Edinburgh City Centre.It is considered an iconic structure and a symbol of Scotland (having been voted Scotland’s greatest man-made wonder in 2016) and is a UNESCO World Heritage Site. The Quebec Bridge was the longest cantilever structure ever to be attempted during its day. A cantilever bridge is a bridge built using cantilevers: structures that project horizontally into space, supported on only one end. The cantilever arms would reach a distance of 171.5 m (562.5 ft.). Due to lack of supporting piers in the Cantilever Bridges, it gives extra flexibility to the style and geometry of the highway supported by this Bridge . 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