To amend title 23, United States Code, to establish a program for expanding the capacity of heavily-traveled portions of the National System of Interstate and Defense Highways located in urbanized areas with a population of 50,000 or more for the purposes of reducing traffic congestion, improving safety, and increasing the efficiency of the System.

[AI summary unavailable — showing source text] Authorizes the Secretary of Transportation to approve projects within urbanized areas with populations of 50,000 or more for expanding the capacity of open-to-traffic routes on the Interstate Highway System, including construction of noise barriers, acquisition of right-of-ways for future construction of mass transit facilities, and acquisition of land for construction of parking lots. Sets forth a formula for apportionment of highway funds for such projects. Specifies: (1) the period of availability of funds apportioned to a State for Interstate System capacity expansion; (2) conditions that must be met in order to use lapsed funds for discretionary projects; and (3) the Federal share (80 percent) of any such expansion projects. Authorizes appropriations for FY 1993 through 1996.…