United States Department of Transportation
i
System
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2017-06-01
[PDF-347.81 KB]
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Abstract:Document which discusses the issues for vertical clearance on the interstate rods which were standardize to 14 feet according to the American Association of State Highway Officials (AASHO). It presents why this did not meet some requirements for the Department of Defense and resulted in revisions occurring to the standard. The document discusses this controversy, the implementation of the revision, and the effects it had.
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Content Notes:The original format of this document was an active HTML page(s) located under https://www.fhwa.dot.gov/infrastructure/history.cfm. The Federal Highway Administration converted the HTML page(s) into an Adobe® Acrobat® PDF file to preserve and support reuse of the information it contained. The intellectual content of this PDF is an authentic capture of the original HTML file. Hyperlinks and other functions of the HTML webpage may have been lost, and this version of the content may not fully work with screen reading software.
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