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PUBLIC LAW 85-767-AUG. 27, 1958
[72 S T A T.
(b) The Federal-aid primary system shall consist of an adequate system of connected main highways, selected or designated by each State through its State highway department, subject to the approval of the Secretary as provided by subsection (e) of this section. This system shall not exceed 7 per centum of the total highway mileage of such State, exclusive of mileage within national forests, Indian, or other Federal reservations and within urban areas, as shown by the records of the State highway department on November 9, 1921. "Wlienever provision has been made h^ any State for the completion and maintenance of 90 per centum of its Federal-aid primary system, as originally designated, said State through its State highway department by and with the approval of the Secretary is authorized to increase the mileage of its Federal-aid primary system by additional mileage equal to not more than 1 per centum of the total mileage of said State as shown by the records on November 9, 1921. Thereafter, it may make like 1 per centum increases in the mileage of its Federalaid primary system- whenever provision has been made for the completion and maintenance of 90 per centum of the entire system, including the additional mileage previously authorized. This sj^stem may be located both in rural and urban areas. The mileage limitations m this paragraph shall not apply to the District of Columbia, Hawaii, AlasKa, or Puerto Rico. (c) The Federal-aid secondary system shall be selected by the State highway departments and the appropriate local road officials in cooperation with each other, subject to approval by the Secretary as provided in subsection (e) of this section. I n making such selections, larm-to-market roads, rural mail routes, public school bus routes, local rural roads, county roads, township roads, and roads of the county road class may be included, so long as they are not on the Federal-aid primary system or the Interstate System. This system shall be confined to rural areas, except (1) that in any State having a population density of more than two hundred per square mile as shown by the latest available Federal census, the system may include mileage in urban areas as well as rural, and (2) that the system may be extended into urban areas subject to the conditions that any such extension passes through the urban area or connects with another Federal-aid system within the urban area, and that Federal participation in projects on such extensions is limited to urban funds. (d) The Interstate System shall be designated within the continental United States and it shall not exceed forty-one thousand miles in total extent. I t shall be so located as to connect by routes, as direct as practicable, the principal metropolitan areas, cities, and industrial centers, to serve the national defense, and to connect at suitable border points with routes of continental importance in the Dominion of Canada and the Republic of Mexico. The routes of this system shall be selected by joint action of the State highway departments of each State and the adjoining States, subject to approval by the Secretary as provided in subsection (e) of this section. All highways or routes included in the Interstate System as finally approved, if not already coincident with the primary system, shall be added to said system without regard to the mileage limitation set forth in subsection (b) of this section. This system may be located both in rural and urban areas. (e) The Secretary shall have authority to approve in whole or in part the Federal-aid primary system, the Federal-aid secondary system, and the Interstate System, as and when such systems or portions thereof are designated, or to require modifications or revisions thereof. No Federal-aid system or portion thereof shall be eligible for projects in which Federal funds participate until approved By the Secretary.
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