High Priority Corridor

The Intermodal Surface Transportation Efficiency Act of 1991 (Public Law 102-240; ISTEA, pronounced Ice-Tea) is a United States federal law that posed a major change to transportation planning and policy, as the first U.S. federal legislation on the subject in the post-Interstate Highway System era.

The Act presented an overall intermodal approach to highway and transit funding with collaborative planning requirements, giving significant additional powers to metropolitan planning organizations. Signed into law on December 18, 1991 by President George H. W. Bush, it expired in 1997. It was preceded by the Surface Transportation and Uniform Relocation Assistance Act of 1987 and followed by the Transportation Equity Act for the 21st Century (TEA-21) in 1998, the Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users (SAFETEA-LU) in 2005, and the Moving Ahead for Progress in the 21st Century Act (MAP-21) in 2012. ISTEA also provided funds for non-motorized commuter trails; the first trail to be so funded was the Cedar Lake Regional trail that was built in 1995 in Minneapolis, Minnesota.

ISTEA defined a number of High Priority Corridors, to be part of the National Highway System. After various amendments from other laws, this is a list of the Corridors:

The legislation also called for the designation of up to five high-speed rail corridors. The options were studied for several months, and announced in October 1992. The first four were announced by United States Secretary of Transportation Andrew Card, while the last was announced by Federal Railroad Administration head Gil Carmichael.

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