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Article: Bridges.(Streets and Highways)
- Article from:
- Public Works
- Article date:
- April 15, 1995
CopyrightCOPYRIGHT 1995 Hanley-Wood, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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The Federal Highway Administration's Transportation Research Board reports that about one-half of the approximately 600,000 highway bridges in the United States were built before 1940. Most were designed for less traffic, smaller vehicles, slower speeds, and lighter loads. In addition, even in newer bridges, deterioration caused by service conditions and deferred maintenance is a growing problem. Almost 40 percent of the nation's bridges are classified, according to the Federal Highway Administration's (FHWA) criteria, as deficient and needing rehabilitation or replacement. More than 100,000 of these are judged to be structurally deficient because of deterioration or ...
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