Resources - Loop 202 South Mountain Freeway

Loop 202 South Mountain Freeway

Project Information
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Whether you are looking for the project photos or just want to see what it takes to construct a freeway, the Resources Page provides all of that information and more. Be sure to check out the new flyover video, which reflects the various design modifications that have been made to the South Mountain Freeway since 2013.

South Mountain Freeway - Updated Flyover Video


South Mountain Freeway DDI

The 22-mile South Mountain Freeway includes two half diverging diamond interchanges, commonly known as DDIs. These interchanges, located at Desert Foothills Parkway and 17th Avenue, are the first of their kind in the state.


A DDI is a simple design innovation that addresses congestion and safety by allowing vehicles to travel more efficiently through an interchange. A DDI increases traffic flow by temporarily transitioning traffic to the left side of the road, allowing through-traffic and left-turning traffic to proceed through the interchange simultaneously, eliminating the need for a signalized left turn.

Learn more about DDI
South Mountain Freeway DDI Flyer cover

View Project Photos



Media Resources

For additional information:
ADOT Media Relations
[email protected]