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Answer: NAFTA superhighway is a buzz phrase for major transportation corridors that carry international trade through the three biggest countries of North America: Mexico, the United States and Canada.

These highways existed long before implementation of the North American Free Trade Agreement began on Jan. 1, 1994.

With total domestic freight tonnage projected to increase 67 percent by 2020, the race is on to secure funding to maintain and improve the U.S. domestic transportation infrastructure and to build new roads to alleviate critical congestion on the nation's roads.

Interstate 35, which extends from the Mexican border at Laredo, Texas, to Duluth, Minn., has been referred to as the "NAFTA Superhighway" for many years. I-35 already carries a substantial amount of international trade between Mexico, the United States and Canada.

There is also a push from various states to complete I-69 so that it will go from the Rio Grande Valley in Texas to the Port Huron border crossing in Michigan. Currently, I-69 starts at Port Huron and ends in Indianapolis.

However, a powerful group of proponents, including former House Majority Leader Tom DeLay of Texas and former Senate Majority Leader Bill Frist of Tennessee, has worked to extend it down the Mississippi River to Memphis, Tenn., then south into Arkansas and Louisiana, and finally through Texas to the Mexican border.

Texas, meanwhile, has proposed a system of superhighways called the Trans-Texas corridor.

Q&A on the news