President’s Advisory Committee on a National Highway Program, National Highway Program (1955)
“ 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. ”
