PUBLIC LAWS-CH. 626-DEC. 20 , 1944 Disposition of un- expended balances. Deductions for ad- Vances not repaid. National System of Interstate Highways. Designation, extent, location, etc. Selection of routes. 42 Stat. 212 . 23U.S. c. 0i 1-25 . Surveys, etc., of projects for future construction. 42 Stat. 212 . 23U.S.0. 1; SBpp. Im, 2 et ca. 42 Stat. 212 , 218; infra. 23 U. . 0.f3,23. Appropriation au- thorized. 23U.8.C.i23. Forest highways. Roads and trails. Forest highways In Alaska, etc. Park roads and trails. 1 U.S .B. i0.8 Ld performed in accordance with plans, specifications, and estimates approved by the Public Roads Administration under the provisions of this Act. Any unexpended balances of funds so advanced shall be returned to the credit of the appropriation from which the funds have been advanced: Provided, That any advance made to any State under the provisions of this section and not repaid shall be deducted from any apportionment allocated to such State under the provisions of this Act for the year next succeeding the year in which such advance is made, and no agreement made in accordance with the provisions of section 2 of this Act shall be valid for any pro rata share of the cost of construction in excess of such apportionment less such advance. SEC. 7. There shall be designated within the continental United States a National System of Interstate Highways not exceeding forty thousand miles in total extent so located as to connect by routes, as direct as practicable, the principal metropolitan areas, cities, and indus- trial 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 the National System of Interstate Highways shall be selected by joint action of the State highway departments of each State and the adjoining States, as provided by the Federal Highway Act of November 9, 1921, for the selection of the Federal-aid system. All highways or routes included in the National System of Interstate Highways as finally approved, if not already included in the Federal-aid highway system, shall be added to said system without regard to any mileage limitation. SEc. 8. With the approval of the Federal Works Administrator, not to exceed 11/2 per centum of the amount apportioned for any year to any State under the Federal Highway Act, as amended and sup- plemented, except sections 3 and 23 thereof, shall hereafter be used with or without State funds for surveys, plans, engineering, and economic investigations of projects for future construction in such State, on the Federal-aid highway system and extensions thereof within municipalities, on secondary or feeder roads, urban highways or grade-crossing eliminations, and for highway research necessary in connection therewith. SEC. 9. For the purpose of carrying out the provisions of section 23 of the Federal Highway Act (42 Stat. 218), as amended and sup- plemented, there is hereby authorized to be appropriated (1) for forest highways the sum of $25,000,000 for the first post-war fiscal year and a like amount for each of the second and third post-war fiscal years; and (2) for forest development roads and trails the sum of $12,500,000 for the first post-war fiscal year and a like amount for each of the second and third post-war fiscal years: Provided,That the apportionment for forest highways in Alaska shall be for each year $1,500,000 and that such additional amount as otherwise would have been apportioned to Alaska for each of said years shall be apportioned among those States, including Puerto Rico, whose forest highway apportionment for such year otherwise would be less than 1 per centum of the entire apportionment for forest highways for that year. SEc. 10. (a) For the construction, reconstruction, improvement, and maintenance of roads and trails, inclusive of necessary bridges, in national parks, monuments, and other areas administered by the National Park Service, including areas authorized to be established as national parks and monuments, and national park and monument approach roads authorized by the Act of January 31, 1931 (46 Stat. 1053), as amended, there is hereby authorized to be appropriated the sum of $12,750,000, to become available at the rate of $4,250,000 a year for each of the three successive post-war fiscal years. [58 STAT.
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