Bridge Safety Act

Bridge Safety Act - Title I: Bridge Program - Authorizes the Secretary of Transportation to approve Federal participation in a State project to repair or replace unsafe highway bridges under a needs formula as established in this Act.

Stipulates that the Federal share of any such project shall not exceed 90 percent of its cost.

Amends the Highway Safety Act of 1976 to authorize appropriations out of the Highway Trust Fund of $180,000,000 for the period beginning July 1, 1976 and ending September 30, 1976 and $720,000,000 for each of the fiscal years beginning October 1, 1976 and ending September 30, 1980.

Title II: Extension of Highway Trust Fund and Certain Related Provisions - Amends the Highway Revenue Act of 1956 to extend appropriations for the Highway Trust Fund through fiscal year 1990.

Amends the Land and Water Conservation Fund Act to extend the fund through fiscal year 1990. Postpones specified excise tax reductions under the Internal Revenue Code of 1954.