The Arizona Department of Transportation announced on June 1 that it is conducting a study, in cooperation with the City of Phoenix and Maricopa Association of Governments, to evaluate potential improvements to Interstate 10 in downtown Phoenix. The initiative aims to address traffic operations, safety concerns, and regional travel needs along this busy corridor.
The study area covers I-10 from the Deck Park Tunnel to the I-10/I-17 “Split” interchange near Phoenix Sky Harbor International Airport. It also includes State Route 51 south of Thomas Road, Loop 202 west of 24th Street, and the “Mini-Stack” interchange where these highways meet. As part of the process, ADOT will develop and assess alternative design concepts such as reconfiguring freeway ramp connections and lane configurations through this section.
Members of the public are invited to provide feedback by participating in an online survey through June 30 or by contacting ADOT via email, telephone, or mail using information available at azdot.gov/I-10TunneltoSplit. A public meeting is planned for fall 2026 to share proposed design alternatives and gather additional input. In late 2027 or early 2028, a public hearing will be held regarding the Draft Environmental Assessment.
According to ADOT, traffic congestion during morning and afternoon commutes is significant within this segment of I-10 and is projected to worsen over time. Without improvements, average delays during peak travel times could increase by up to 60% by 2050.
Arizona Department of Transportation manages various facilities across the state—including rest areas and highway cameras—and works alongside regional partners on projects like corridor studies and traveler information systems; it also offers services such as traveler updates via AZ 511 system and oversees infrastructure enhancements at airports and ports, according to the official website. Jennifer Toth serves as director, overseeing planning, design, construction, maintenance, and operation for Arizona’s transportation systems.
