A bill to authorize appropriations for the construction of certain highways in accordance with title 23 of the United States Code, to amend the Highway Safety Act of 1966 to authorize appropriations, and for other purposes.

[AI summary unavailable — showing source text] Title I: Federal Aid Highway Act of 1981 - Amends the Federal Aid Highway Act of 1956 to increase the authorization of appropriations for the Interstate Highway System for fiscal years 1983 through 1990. Limits the obligation of such funds to specified objectives. Directs the Secretary of Transportation, in making the revised estimate of the cost by completing the then designated Interstate System, to include only those costs eligible under such Act, as amended. Authorizes the Secretary to assess the status of all incomplete segments of the Interstate System and to withdraw approval of any routes as appropriate. Directs the Secretary to use specified apportionment factors in allocating funds for the Interstate System. Authorizes appropriations, for fiscal years 1982 through 1986, out of the Highway Trust Fund for: (1) the Federal aid primary system in rural and urban areas; (2) forest highways; (3) public lands highways; (4) bridge replacement and rehabilitation; and (5) resurfacing, restoring, rehabilitating, and reconstructing (through fiscal year 1987) certain nontoll portions of the Interstate System. Directs that the unobligated balance of contract authority established by the…