First phase of improvements at US 60, Loop 303 and 163rd Avenue nearing completion

The Arizona Department of Transportation is nearing completion of the first phase of interim improvements on US 60 and Loop 303, which includes a current project to widen, pave and restripe the US 60/163rd Avenue and US 60/Loop 303 intersections to add more lanes and improve traffic flow.

Traffic is currently open in the new lane configuration, following work last night. Final paving and temporary lane striping is scheduled to be completed tonight.

Final striping of the new lanes is scheduled in late August, once the pavement has cured, but will not require any road closures.

The completed improvements include:

US 60/Loop 303

• Adding a third left turn lane and second right turn from the northbound Loop 303 off-ramp to US 60 and adding a second exit lane from northbound Loop 303 to US 60.
• Adding an additional through lane along westbound US 60 at Loop 303 to accommodate the left turning traffic from Loop 303 (approaching and departing the Loop 303 interchange ramps).  The additional lane allows for a greater volume of traffic to continue through the intersection while maximizing the green signal timing for the turning movements, ultimately avoiding a back-up along the US 60/303 mainline as cars wait for the signal. 

US 60/163rd Avenue

• Adding a third left turn lane from southbound 163rd Avenue to eastbound US 60.
• Adding a second right turn lane from westbound US 60 to 163rd Avenue.
• Extending the existing east- and westbound US 60 third lane to 163rd Avenue. This will provide three through lanes in each direction from the Loop 303 interchange to just beyond 163rd Avenue.
• Adding a second northbound through lane on 163rd Avenue from south of US 60.

The second phase of interim improvements is planned to begin in early fall 2025. As changes are implemented, ADOT and project partners will continue to evaluate the corridor’s operations to ensure it operates as efficiently as possible. 

Phase 2 improvements include:

• Widening eastbound US 60 approaching southbound Loop 303 to add an additional right turn lane.
• Widening southbound Loop 303 to extend the merge lane onto Loop 303. 
• Widening southbound Loop 303 to the US 60 ramp to have three dedicated left turn lanes onto westbound US 60 and one right turn lane onto eastbound US 60.

We appreciate your patience during construction. Visit the project website at azdot.gov/us60-303-upgrades for more information and to subscribe for project updates and traffic alerts by email.

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Schedules are subject to change based on weather and other unforeseen factors. For more information, please call the ADOT Bilingual Project Information Line at 855.712.8530 or go to azdot.gov/contact and select Projects from the drop-down menu. For real-time highway conditions statewide, visit ADOT's Traveler Information Site at www.az511.gov, download the AZ511 app or call 511. Need to know where a milepost is? Click on the "Mile Markers" icon on the map at at www.az511.gov.