A joint resolution to approve the Interstate and Interstate Substitute Cost Estimates, to amend title 23 of the United States Code, and for other purposes.

Approves the interstate highway cost estimate for FY 1985 and 1986 and the interstate substitute cost estimate for FY 1984, 1985, and 1986. Directs the Secretary of Transportation to adjust and reallocate the minimum allocation made on March 9, 1984, to reflect the apportionments made under this Act.

Approves the interstate highway cost estimate for FY 1987 and 1988. Revises the procedure for releasing interstate construction funds and interstate substitute funds, including allowing the Secretary to release such funds without congressional approval.

Makes FY 1984 funds apportioned for highway or public mass transit projects available for obligation through FY 1986.