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1 Includes mileage of county roads under State control in Alabama (4 counties), Delaware, North Carolina, Virginia (all but 2 counties), and West Virginia; 6,611 miles designated as farm-to-market systemic Louisiana; State-aid systemic Maine; and 19 miles of State-aid roads in Montana.

2 Includes mileage of State park, forest, institutional, toll, and other roads, rural and municipal, that are not a part of the State or local highway systems.

3 Includes local roads designated as State-aid mileage a follows: Illinois, 19,983 miles; Minnesota, 15,634 miles; and Vermont, 2,550 miles.

4 Roads not on county, town, or township systems. The mileage shown for California, Colorado, and Wyoming has not been classified by administrative system.

5 Includes only the mileage of roads not forming a part of the State or local highway system.

6 Municipal extensions of county, town, and township roads cannot be segregated for all States.

7 Mileage previously reported here is now part of the State primary and local road systems.

8 Toll roads are included as follows: Colorado, Denver-Boulder Turnpike, 17 miles; Connecticut, Merritt, and Wilbur Cross Parkways, 67 miles; Florida, Buccaneer Trail, 15 miles; Georgia, Brunswick-St. Simon Highway, 11 miles; Maine Turnpike, 45 miles; New Hampshire Turnpike, 15 miles; New Jersey Turnpike, 118 miles, New York county parkways, 26 miles, State parkways, 13 miles; and the New York State Thruway, 80 miles; Oklahoma, Turner Turnpike, 88 miles; Pennsylvania Turnpike system, 328 miles.

Source: Department of Commerce, Bureau of Public Roads.