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Hart Bridge
The Isaiah David Hart Bridge is a truss bridge that spans the St. Johns River in Jacksonville, Florida. It carries U.S. Route 1 Alternate/State Road 228. It is named after Isaiah Hart, the founder of Jacksonville. It was designed by Sverdrup & Parcel.〔Durkee, Jackson, ("World's Longest Bridge Spans" ), National Steel Bridge Alliance, May 24, 1999〕
==Details==
The bridge has traditionally been painted green and is often referred to as "The Green Monster" by locals.〔(Florida Times Union )〕〔(Jax Air News )〕 The westbound end of the bridge delivers drivers to downtown Jacksonville or Martin Luther King Expressway, while the eastbound end sends motorists to Beach Boulevard. Daily traffic is 47,000 vehicles. The stretch of highway between downtown and Beach Blvd. is known as the Commodore Point Expressway, but more commonly referred to by locals as the Hart Bridge Expressway.
The bridge is a steel cantilever bridge which is a type of continuous truss bridge. The bridge's main span is uncommon for a cantilever bridge in that the truss over the main channel tapers upward and the roadway below is suspended from the truss by steel hangers.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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