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The problem The Interstate 5 Phoenix interchange (exit 24) experiences traffic congestion throughout the day, especially during morning and afternoon commutes. Existing and proposed development along the east side of I-5, as well as development growth within the Rogue Valley, are choking the interchange’s capacity and causing safety concerns. The solution Prior to the IAMP approval last February, the Project Development Team unanimously supported the “North Phoenix Through” build alternative as part of the federally-required Environmental Assessment.

The project’s design phase began in 2004. The “Fern Valley Through” design alternative was eliminated in 2009 because it would have an adverse impact on nearby farm land. ODOT will construct the Fern Valley Interchange project using a crossing-diamond design that provides a higher capacity to move traffic while reducing right-of-way needs. Vehicles crossing the interchange move to the opposite side of the road to either enter I-5 or to cross it, reducing the number of signal cycles for traffic to clear. The Missouri Department of Transportation was the first agency to construct an interchange of this design in the United States.

For more information about the Fern Valley Interchange project visit the website:

April 1, 2011