Highway and Public Transportation Improvement Act

[AI summary unavailable — showing source text] Highway and Public Transportation Improvement Act - Title I: - Amends the Federal-Aid Highway Act of 1956 to authorize the use of funds appropriated for the Interstate Highway System for highway assistance substitution projects. Reduces the appropriations for the Interstate System for fiscal years 1980 through 1990. Directs the Secretary of Transportation to apportion the authorization for fiscal year 1980 in a specified manner. Authorizes appropriations out of the Highway Trust Fund for specified Federal-aid highway programs through fiscal year 1982. Title II - Amends the Highway Revenue Act of 1956 to extend the authorization for appropriations under such Act for the Highway Trust Fund through fiscal year 1978. Amends the Land and Water Conservation Fund Act of 1965 to extend the transfers of specified nonhighway use gasoline taxes from such fund to the general fund of the Treasury. Postpones specified transportation related excise tax reductions under the Internal Revenue Code of 1954. Title III - Prohibits the Secretary from approving substitute State mass transportation projects in lieu of an interstate project after fiscal year 1984. Revises the funding mechanism for such sub…