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}} The Queensboro Bridge, also known as the 59th Street Bridge – because its Manhattan end is located between 59th and 60th Streets – and officially titled the Ed Koch Queensboro Bridge, is a cantilever bridge over the East River in New York City that was completed in 1909. It connects the neighborhood of Long Island City in the borough of Queens with Manhattan, passing over Roosevelt Island. It carries New York State Route 25 and is the westernmost of the four East River spans that carry a route number: NY 25 terminates at the west (Manhattan) side of the bridge, which once carried NY 24 and NY 25A as well. The bridge is flanked on its northern side by the freestanding Roosevelt Island Tramway. The bridge was, for a long time, simply called the Queensboro Bridge, but in March 2011, the bridge was officially renamed in honor of former New York City mayor Ed Koch.〔(Ed Koch Queensborough bridge: Span officially renamed in honor of former New York City mayor )〕 No tolls are charged for motor vehicles to use the bridge. The Queensboro Bridge is the first entry point into Manhattan in the course of the New York City Marathon and the last exit point out of Manhattan in the Five Boro Bike Tour. ==Description== The Queensboro Bridge is a two-level double cantilever bridge. It has two cantilever spans, one over the channel on each side of Roosevelt Island. The bridge does not have suspended spans, so the cantilever arm from each side reaches to the midpoint of the span.〔(【引用サイトリンク】title=Project Page:2000 Biennial Bridge Inspection of the Queensboro Bridge over the East River )〕 The lengths of its five spans and approaches are as follows: *Manhattan to Roosevelt Island span length (cantilever): *Roosevelt Island span length: *Roosevelt Island to Queens span length (cantilever): *Side span lengths: *Total length between anchorages: *Total length including approaches: Until it was surpassed by the Quebec Bridge in 1917, the span between Manhattan and Roosevelt Island was the longest cantilever span in North America.〔(【引用サイトリンク】title=Queensboro Bridge )〕 The upper level of the bridge has four lanes of automobile traffic and provides a view of the bridge's cantilever truss structure and the New York skyline. The lower level has five vehicular lanes, the inner four for automobile traffic and the southern outer lane for automobile traffic as well, used exclusively for Queens-bound traffic. The North Outer Roadway was converted into a permanent pedestrian walk and bicycle path in September 2000.〔(【引用サイトリンク】title=Queensboro Bridge Rehabilitation Program )〕 The Manhattan approach to the bridge is supported on a series of Guastavino tile vaults which now form the elegant ceiling of the Food Emporium Bridge Market and the restaurant Guastavino's, located under the bridge. Originally, this open air promenade was known as Bridgemarket and was part of Hornbostel's attempt to make the bridge more hospitable in the city. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Queensboro Bridge」の詳細全文を読む スポンサード リンク
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