The CANAMEX corridor is a series of improvements to freeways and other transportation infrastructure linking Canada to Mexico through the United States.
[1] While the tri-lateral corridor was defined in NAFTA, the U.S. portion of CANAMEX Trade Corridor was outlined in 1991 in the "ISTEA" highway bill, and defined by Congress in the 1995 National Highway Systems Designation Act, Public Law 104-59, November 28, 1995.
Making the connection originally required driving U.S. Route 60, a surface street through the western suburbs of Phoenix that was not compliant with the standards established by the treaty.
The chosen alternative for resolution involved creating a compliant connection between Wickenburg and Phoenix via upgrades and extensions to Arizona State Route 303.
The Union Pacific again owns tracks following the I-15 portion of the corridor from Las Vegas, to Butte, Montana, acquired from the former Los Angeles and Salt Lake Railroad and Oregon Short Line.