The cantilever arms would reach a distance of 171.5 m (562.5 ft.). In Scotland, the Forth Bridge is another famous cantilever bridge. 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. The Pont de Quebec - or Quebec Bridge - in Canada is a steel structure that takes the title of longest cantilever bridge in the world with its impressible 549 metre (1,801 foot) main span. A cantilever bridge is a bridge built using cantilevers: structures that project horizontally into space, supported on only one end. 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. 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 . This list of cantilever bridges ranks the world's cantilever bridges by the length of their main span. The bridge was rebuilt and expanded in the 1980s, and the project was completed in 1989. As of 2010, the Quebec Bridge in Canada holds the record for the longest single cantilever span. Othmar H. Ammann provided the design, while Cass Gilbert served as the architect. The bridge comprises of 14 lanes, including eight on the upper deck and six on the lower deck. 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. Cantilever bridges have multiple cantilever spans and can be immediately started from all the columns . The longest cantilevered roof in the world. 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. Above: The Pont de Quebec Bridge is still the world's longest cantilever bridge after … This list only includes bridges that carry automobiles or trains. Longest Cantilever Bridge Span: The Quebec Bridge, Quebec Credit: Design Pics Inc. / Alamy. Completed cantilever bridges. Completed cantilever bridges Edit This list only includes bridges that carry automobiles or trains. The Quebec Bridge was the longest cantilever structure ever to be attempted during its day. 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. 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