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Tappan Zee Bridge replacement
State and federal agencies are in the process of replacing the Governor Malcolm Wilson Tappan Zee Bridge over New York's Hudson River. Construction began in 2013, with opening targeted for 2017.
==Background==
The original Tappan Zee bridge is a cantilever bridge built during 1952–1955. The bridge is long and spans the Hudson at its second-widest point. The Tappan Zee river crossing was named by 17th century Dutch settlers. The "Tappan" are believed to be a Native American tribe formerly living in the area; ''zee'' is the Dutch word for "sea". The Tappan Zee is the larger of the two bridges serving a stretch of river that passes through New York City's populous northern suburbs, the Bear Mountain Bridge being the smaller.
The deteriorating current structure bears an average of 138,000 vehicles per day, substantially more traffic than its designed capacity. During its first decade, the bridge carried fewer than 40,000 vehicles per day. Part of the justification for replacing the bridge stems from its construction immediately following the Korean War on a low budget of only $81 million. Unlike other major bridges in metropolitan New York, the Tappan Zee was designed to last only 50 years. The new bridge is intended to last at least 100 years.
The collapse of Minnesota's I-35W Mississippi River bridge in 2007 raised worries about the Tappan Zee's structural integrity. These concerns, together with traffic overcapacity and increased maintenance costs, escalated the serious discussions already ongoing about replacing the Tappan Zee with a tunnel or a new bridge. Six options were identified and submitted for project study and environmental review.
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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