A bill to amend section 103(e)(4) of title 23, United States Code, with respect to the determination of the increase of amounts available for substitute highway and transit projects resulting from increased construction costs.

Amends the Surface Transportation Assistance Act of 1982 to revise the standard used to determine the Federal share of the cost to complete a route withdrawn (upon State request) from the Interstate System. States that such Federal share shall be determined by the Secretary of Transportation based on construction cost increases for the period beginning January 1, 1986, and ending on the approval date of each substitute project.