I-10 Broadway Curve Project

Overview

The I-10 Broadway Curve Improvement Project area ran along 11 miles of Interstate 10 between the Loop 202 (Santan/South Mountain Freeway) and the I-17 Split. Construction started in Summer 2021 and finished in Spring 2025. When construction concluded, it was ADOT’s largest urban freeway reconstruction project to date.

Final English Newsletter | Final Spanish Newsletter

Project Components

The goals of the project were to improve traffic flow and increase safety by eliminating weaving and lane changes.  
The major components of the project included:

• Widening I-10 to six general purpose lanes and two high-occupancy vehicle (HOV) lanes in each direction between US 60 (Superstition Freeway) and I-17, and adding a fourth general purpose lane in each direction between Ray Road and US 60
• Adding Collector-Distributor roads parallel to I-10 between Baseline Road and 40th Street to separate through-traffic on I-10 from local traffic entering or exiting the highway
• Rebuilding the I-10 interchange with SR 143 to improve traffic flow and create direct connections to and from SR 143 for drivers in the I-10 HOV lanes
• Replacing the Broadway Road bridge over I-10
• Replacing the 48th Street bridges over I-10
• Widening the I-10 bridges over the Salt River
• Building two bridges for pedestrians and bicyclists over I-10 between Baseline and Broadway roads (at Alameda Drive and the Western Canal) and improving the Sun Circle Trail crossing at Guadalupe Road
• Building sound and retaining walls where warranted.

This project was delivered as a Public-Private Partnership (P3) and Design-Build (DB). 

Project Schedule

Project Materials and Collateral

• Informational Flyer - English | Spanish
• Project Benefits Flyer - English | Spanish
• Construction Photos
• Behind the Scenes Videos
   

Find Your Lane: Navigating the Collector-Distributor (CD) Roads

Built as part of the I-10 Broadway Curve Improvement Project, the Collector-Distributor (CD) roads separate through-traffic from local traffic entering and exiting I-10 between 40th Street and Baseline Road. This reduces the need for vehicles to weave between lanes and help keep traffic flowing on I-10.

• CD Road Information Flyer - English | Spanish
• Entrance and Exit Map - English | Spanish
• Video Animation - English | Spanish

Project History and Documentation