US 60/Loop 303 Traffic Interchange Improvements

US 60/Loop 303 Traffic Interchange Improvements



The Arizona Department of Transportation completed a feasibility study in 2022 to assess the US 60 and Loop 303 (Estrella Freeway) interchange and other intersections along US 60 from 163rd Avenue in Surprise to R H Johnson Boulevard in Sun City West.  

The study evaluated several short-term and long-term projects to improve traffic flow and developed conceptual design plans and cost estimates for each improvement.

Short-term improvements refer to smaller projects that would mitigate some traffic congestion and could be implemented sooner than the long-term improvements.

Project Area Map

US 60 - Loop 303 Traffic Interchange Improvements map


Short-Term Improvements

April 2023 the Arizona State Legislature approved funding to initiate final design and construction of some short-term improvements. Some of these improvements will be made in December 2023. Construction of the remaining improvements is anticipated to begin summer 2024 and take approximately 10 months to complete.

These improvements include:

US 60/163rd Avenue

  • Add a third left turn lane from southbound 163rd Avenue to US 60
  • Add a second right turn lane from northbound/westbound US 60 to 163rd Avenue. (December 2023)
  • Extend the existing east- and westbound US 60 third lane to 163rd Avenue (westbound December 2023; eastbound summer 2024)

Note: No pavement widening is needed for any of these improvements.

US 60/163rd Avenue


US 60/Loop 303

  • Add a second lane to the northbound Loop 303 off-ramp at US 60
  • Widen the Loop 303/US 60 intersection and Loop 303 northbound off-ramp to provide three dedicated left turn lanes and one dedicated right turn lane from the northbound Loop 303 off-ramp to US 60

US 60/Loop 303


Other improvements include restriping, new signs, traffic-signal timing adjustments and railroad coordination.

Long-Term Improvements

The feasibility study identified some possible long-term improvements that could be implemented as part of future reconstruction of the US 60/Loop 303 interchange.

Possible improvements include:

  • Construct a diamond interchange at US 60 and Loop 303
  • Construct new southbound Loop 303 off-ramp and northbound Loop 303 on-ramp over the railroad tracks
  • Grade separate eastbound US 60 through lanes between 163rd Avenue and RH Johnson Boulevard to go over Loop 303.
  • Build a US 60 overpass at 163rd Avenue. Traffic on 163rd Avenue could be serviced by a ground-level Single Point Urban Interchange (SPUI) interchange.

NOTE: These improvements are subject to change. Further study will be required to determine the final configuration of the long-term improvements.


  • The study began in November 2021 and was completed in June 2022 with the release of the US60/SR303L Traffic Interchange (TI) Feasibility Report (See report under the Document tab) 
  • ADOT is initiating the final design of the short-term alternatives, with construction anticipated to begin in 2024.



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