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

Title I: Federal-Aid Highway Act - Authorizes to be appropriated for the purpose of expediting the construction, reconstruction, or improvement, inclusive of necessary bridges and tunnels, of the Interstate System, including extensions thereof through urban areas, the additional sums of $1,000,000,000 for the three-month period ending September 30, 1976, and $4,000,000,000 per year through fiscal year 1988.

Authorizes appropriations through fiscal year 1978 for Federal-aid highway systems in the United States, Guam, American Samoa, and the Virgin Islands. Includes appropriations for the Federal-aid primary and secondary systems in urban and rural areas, for the control of outdoor advertising, and for the control of junkyards.

Extends the time for completion of the Interstate System for nine years, until 1988.

Permits buses up to 102 inches wide to operate on Interstate highways, existing vehicle width limitations notwithstanding. Extends Federal participation in the construction of ferry boats which are part of a Federal-aid highway system to boats constructed for use in Puerto Rico.

Sets forth regulations governing outdoor advertising along Interstate highways, including specific distances from the rights-of-way at which signs may be located and the number of signs per mile which are permitted. States that the Secretary of Transportation shall promulgate standards concerning the lighting, size, number and spacing of such signs. Authorizes certain exceptions to the requirement that signs be erected a certain distance from the highway. Sets forth regulations governing the placement of signs providing directional information about facilities providing goods and services in the interest of the public.

Provides for the allocation from funds appropriated for Federal-aid primary and secondary systems through fiscal year 1978 of specified amounts to be used by the States for highway construction training programs.

Provides for the acquisition of land for rest and recreation areas, and for the preservation and restoration of scenic beauty adjacent to the Federal-aid highways.

Increases by $5,000,000 to a total of $32,761,000 the appropriation authorized for the costs of constructing roadways on Federal dams.

Authorizes appropriations through fiscal year 1978 for the reconstruction or replacement of bridge structures on the Overseas Highway to Key West, Florida.

Title II: Highway Safety Act - Authorizes appropriations through fiscal year 1978: (1) for highway safety programs; (2) for highway safety research and development; (3) for bridge reconstruction and replacement; (4) for projects for high-hazard locations; (5) for the elimination of roadside obstacles; (6) for programs relating to incentives for the enactment of seat belt laws; (7) for programs relating to incentives for the reduction of traffic facilities; and (8) for school bus driver training.

Authorizes appropriations through fiscal year 1978 for projects for the elimination of hazards of railway-highway crossings.

Limits to 25 percent of the funds authorized for a State highway safety program the amount which may be used for incentive programs to encourage the enforcement of seat belt laws or to reduce traffic fatalities.