An Act to authorize appropriations for the construction of certain highways in accordance with title 23 of the United States Code, and for other purposes.

[AI summary unavailable — showing source text] Federal-Aid Highway Act - Provides authorizations for the Interstate highway program through fiscal year 1980 in the amounts of $3,250,000,000 for each fiscal year from 1974 through 1979 and $257,000,000 for fiscal year 1980. Extends the time for completion of the Interstate System until June 30, 1980. Directs the Secretary of Transportation to submit to Congress a revised Interstate System cost estimate in January of 1974, January of 1976 and January of 1978 for apportionment of Interstate funds for fiscal years 1976 and 1977, 1978 and 1979, and 1980, respectively. Authorizes annual appropriations for fiscal years 1974 and 1975 of: (1) $650,000,000 for the Federal-aid primary system in rural areas, and $350,000,000 for the Federal-aid secondary system in rural areas; (2) $650,000,000 for the Federal-aid urban system, and $350,000,000 for the extension of the Federal-aid primary and secondary systems in urban areas; (3) $33,000,000 for forest highways; (4) $16,000,000 for public lands highways; (5) $75,000,000 for forest development roads and trails; (6) $10,000,000 for public lands development roads and trails; (7) $30,000,000 for park roads and trails; (8) $75,000,000 for Indian …