PHOENIX – The Interstate 10 Broadway Curve improvement project is complete after four years of adding new lanes, bridges and  ramps.

The Arizona Department of Transportation announced the milestone Tuesday.

“As the largest urban freeway reconstruction project in Arizona, the benefits are endless for everyone who relies on our highway system — that includes motorists and the thousands of businesses along the corridor,” ADOT Director Jennifer Toth said.

“By improving safety and reducing congestion, this project supports our agency’s vision to safely connect people and empower the economy. We’re already seeing results.”

Drivers may still see crews putting finishing touches on the project such as planting bushes and completing some wall and barrier work, according to ADOT.

The project expanded capacity along 11 miles of I-10 from just south of Ray Road to Interstate 17 near Phoenix Sky Harbor International Airport. Construction began in the summer of 2021. Some of the major components of the project included: 

• Adding additional travel and HOV lanes in both directions on I-10 between US 60 and I-17 by Sky Harbor.
• Construction of collector distributor roads to separate mainline traffic from traffic that’s entering and exiting the freeway. 
• Construction of new 48th Street and Broadway Road bridges.
• Rebuilding the I-10 interchange with SR 143, and constructing new HOV flyover ramps that connect I-10 and SR 143.
• Widening the I-10 bridge over the Salt River to make room for additional travel lanes.
• Constructing two new multi-use bridges over I-10 between Baseline and Broadway roads.
• Constructing several sound and barrier walls throughout the project area. 

This project was paid for using federal funds, Maricopa Association of Government’s Prop 400 (a dedicated half-cent sales tax that was approved by Maricopa voters in 2004) and local contributions.