1992. Federal Highway Administration, Office of Intermodal and Statewide Programs (HEPS-20). The National Highway Planning Network is a comprehensive network database of the nation's major highway system. It consists of over 400,000 miles o... Bureau of Transportation Statistics.
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1992. Federal Highway Administration, Office of Intermodal and Statewide Programs (HEPS-20). The National Highway Planning Network is a comprehensive network database of the nation's major highway system. It consists of over 400,000 miles o... Bureau of Transportation Statistics.