Major roadwork is underway along Interstate 17 between Anthem Way and Sunset Point until 2025.
Welcome to the I-17 Improvement Project
The 23-mile section of Interstate 17 (I-17) between Anthem Way and Sunset Point is one of the most heavily utilized roadways in Arizona, seeing more than 1 million travelers each year.
Currently, I-17 has two travel lanes in each direction between Anthem Way, north of Phoenix, and Flagstaff. The highway passes through rolling terrain in the southern and northern segments and mountainous terrain with steep, narrow lanes between Black Canyon City and Sunset Point.
We look forward to improving this stretch of I-17 north of Phoenix. The work includes widening 15 miles of roadway, replacing two bridges and widening 10 others, and constructing approximately eight miles of flex lanes.
What are Flex Lanes?
The flex lane system is a proven technology to alleviate traffic congestion during peak travel times, or if an unplanned incident creates delays. The flex lanes will operate as an additional two-lane roadway that carries one direction of traffic at a time and can alternate between north- and southbound depending on the greatest need due to capacity.
Construction Runs Through 2025
Construction began in 2022 and ADOT anticipates it will take approximately three years to complete. This timeline makes it possible for the project team to minimize impacts on the traveling public while work is underway. Because much of the travel and congestion on I-17 occurs on weekends, lane closures will primarily be limited to weeknights from 7 p.m. to 6 a.m. However, travelers should remain cautious in the construction zone, which will be active seven days a week. No weekend lane closures will be scheduled for construction, which allows you to use I-17 during peak travel days and times with limited construction impacts or restrictions. (A closure might occur on a weekend because of an emergency or unplanned incident.)
While work continues on the I-17 Improvement Project, everyone will need to plan ahead to find the best approach for navigating construction along the I-17 corridor. That means people who live in the area, who use the I-17 corridor for work or weekend trips, and local business owners and visitors will be impacted in various ways.
Click the section below that best represents your travel needs. We’ll cover what to expect and provide tips.
The section of I-17 between Anthem Way and Sunset Point is one of the most heavily utilized roadways in Arizona, with more than 1 million travelers each year. This project will help improve I-17 for motorists, businesses, visitors and others. For example:
This project will reduce congestion, which helps to improve safety by creating more space between vehicles.
With the addition of new travel lanes from Anthem Way to Black Canyon City and flex lanes from Black Canyon City to Sunset Point, capacity on the I-17 will increase in both directions. This will better accommodate existing traffic and increased traffic as the demand on I-17 continues to grow.
This stretch of road sees heavy usage during weekends, causing long delays. These improvements will increase capacity and alleviate congestion. Greater efficiency means drivers can get to and from the places they need to be in less time, and more safely.
The addition of the flex lanes will allow traffic to move more efficiently and reduce travel times. In the event of a crash that blocks lanes, the new flex and general purpose lanes will make it easier for motorists to travel safely through the affected areas and prevent miles-long backups.
Each year, more than $300 billion in goods are shipped to and from Arizona. I-17 is identified as one of the state’s key commerce corridors, moving people and goods between southern and northern Arizona. This vital highway also connects to I-10 and I-40, two of the nation’s principal east-west interstate highways. I-10 and I-40 are also two of Arizona’s key commerce corridors and are essential for future, quality economic growth in Arizona. This project will help make I-17 a more favorable route for commercial truck drivers whose travels through the region support our local businesses.
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