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Number of Road Bridges by Functional System

Notes: 

Some discrepancies exist between the total number of bridges reported in tables 1-5, 1-6, and 1-7 because of bridges not identified in one or more of the categories and other anomalies.

Source: 

U.S. Department of Transportation, Federal Highway Administration, Office of Bridge Technology, National Bridge Inventory, Functional Classification of Bridges by Highway System, available at as of July 2015.

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