Arizona Seeks Public Input on Mini-Stack Traffic Plans
The Arizona Department of Transportation is holding meetings to address congestion and safety at the Phoenix interchange.
Updated on Oct. 28, 2026 in Car Types
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The Arizona Department of Transportation is soliciting public feedback on proposed improvements for the busy Mini-Stack interchange in Phoenix. The initiative aims to address chronic traffic congestion and safety concerns along the corridor where Interstate 10, State Route 51, and Loop 202 meet.
Why it matters
Congestion in the area is projected to worsen significantly over the next few decades, necessitating infrastructure changes to maintain traffic flow. Proactive planning seeks to mitigate these future delays and improve safety for commuters traveling through the heart of the city.
Between 2016 and 2021, the corridor recorded an average of more than five crashes daily. Projections indicate that rush-hour delays at the interchange could climb by as much as 60% by 2050 without intervention.
The players
Arizona Department of Transportation
The state agency responsible for planning, building, and maintaining the highway system throughout Arizona.
The details
The study focuses on the I-10 corridor from the Deck Park Tunnel to the I-10/I-17 Split, including segments of SR 51 and Loop 202. Officials are evaluating solutions such as new collector-distributor roads, additional traffic lanes, and various ramp modifications to resolve systemic bottlenecking.
Timeline
From 2016 through 2021, the corridor saw an average of five crashes daily.
An in-person public meeting is scheduled for November 5, 2026, from 5:30 to 7 p.m. at Garfield Elementary School.
A virtual public meeting will be held on November 9, 2026.
A formal public hearing on the draft environmental assessment is expected in late 2027 or early 2028.
Traffic delays are projected to grow by up to 60% by the year 2050.
Roadmap
This project follows the formal procedures set by the National Environmental Policy Act (NEPA) environmental assessment process. The planning phase aligns with standard infrastructure development lifecycles required to secure long-term federal and state funding for major highway corridors.
Drivers using the interchange can expect to participate in planning meetings that will shape the future of their daily commutes. The project aims to reduce daily collision risks and manage the projected 60% increase in future congestion for local motorists.
The takeaway
Commuters should prepare for long-term construction projects as the state addresses worsening congestion at this critical junction. Engaging with the upcoming public meetings is the most effective way for residents to provide input on the proposed infrastructure modifications.
What happens next
A formal public hearing regarding the draft environmental assessment for the Mini-Stack interchange improvements is anticipated to occur in late 2027 or early 2028.
Further reading
Learn more about local infrastructure projects in the Phoenix Car Types section.
Source note: This article includes information reported by KTAR.
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Should the city invest more in upgrading major highway interchanges to reduce future traffic congestion?
