A cantilever bridge is a bridge built using cantilevers: structures that project horizontally into space, supported on only one end. The bridge was rebuilt and expanded in the 1980s, and the project was completed in 1989. Cantilever bridges are suitable for the longest 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. As of 2010, the Quebec Bridge in Canada holds the record for the longest single cantilever span. Above: The Pont de Quebec Bridge is still the world's longest cantilever bridge after … The cantilever arms would reach a distance of 171.5 m (562.5 ft.). The Pont de Québec [Bridge] has left its mark on the history of transportation and engineering in Canada. 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. Flickr.com / shelgerarad. 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. This list only includes bridges that carry automobiles or trains. The simple cantilever bridge is 1,800 feet (549 m) long. The world’s longest cantilever road bridges. The longest cantilevered roof in the world. Cantilever bridges have multiple cantilever spans and can be immediately started from all the columns . 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. This list of cantilever bridges ranks the world's cantilever bridges by the length of their main span. Completed cantilever bridges Edit This list only includes bridges that carry automobiles or trains. 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. 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. Longest Cantilever Bridge Span: The Quebec Bridge, Quebec Credit: Design Pics Inc. / Alamy. 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