Completed cantilever bridges. The essence of Dureraum’s beauty is its super-sized roof known as the Big Roof, which is 163 metres long and 60 metres wide with an 85 metres cantilever portion and weighs 6,376 (metric) tons, making it the longest cantilevered roof in the world. Cantilever bridges are suitable for the longest span. The bridge comprises of 14 lanes, including eight on the upper deck and six on the lower deck. As of 2010, the Quebec Bridge in Canada holds the record for the longest single cantilever span. 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. A cantilever bridge is a bridge built using cantilevers: structures that project horizontally into space, supported on only one end. Completed cantilever bridges Edit This list only includes bridges that carry automobiles or trains. This list of cantilever bridges ranks the world's cantilever bridges by the length of their main span. The longest cantilevered roof in the world. Above: The Pont de Quebec Bridge is still the world's longest cantilever bridge after … The Pont de Québec [Bridge] has left its mark on the history of transportation and engineering in Canada. Othmar H. Ammann provided the design, while Cass Gilbert served as the architect. 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 world’s longest cantilever road bridges. In Scotland, the Forth Bridge is another famous cantilever bridge. Longest Cantilever Bridge Span: The Quebec Bridge, Quebec Credit: Design Pics Inc. / Alamy. Cantilever bridges have multiple cantilever spans and can be immediately started from all the columns . 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.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 was rebuilt and expanded in the 1980s, and the project was completed in 1989. Firth of Forth Bridge. A cantilever bridge is a bridge built using cantilevers: structures that project horizontally into space, supported on only one end. Flickr.com / shelgerarad. 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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