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Public Road Length, Miles by Functional System
The difference in total miles between tables 1-1 and 1-2 results from the Federal Highway Administration's expansion of sample data to derive estimates of road length by different variables. FHWA considers the length totals in this table to be the control totals should a single value be required.
1 Includes other freeways and expressways.
2 Data for Puerto Rico are for 2010.
U.S. Department of Transportation, Federal Highway Administration, Highway Statistics, HM-20, available at www.fhwa.dot.gov/policyinformation/statistics.cfm as of June 2015.