Phoenix Metro Area Projects

Loop 303 Improvement Project: North of Interstate 10

The Arizona Department of Transportation will be improving the Loop 303 corridor to create a six-lane freeway with three general-purpose lanes in each direction between Interstate 17 in Phoenix and I-10 in Goodyear.

The Loop 303 project includes signalized interchanges at major cross streets, an interim interchange with Northern Parkway, improved drainage, sound mitigation walls where warranted by noise studies, retaining walls, and lighting and signage. Motorists can look forward to more efficient travel; a quieter, smoother roadway through the use of rubberized asphalt; and freeway aesthetics that include decorative rock, painted freeway structures, wall art and the use of salvaged desert vegetation.

The Loop 303 improvement project consists of several phases of construction, beginning and ending at different times during the next several years. As a result, the public should expect active construction zones on Loop 303 as noted:

  • Loop 303 / I-10 Traffic Interchange: December 2011 to fall 2014
  • Loop 303 / US 60 (Grand Avenue) Interchange: Construction scheduled to begin late 2014
  • US 60 (Grand Avenue) to Happy Valley Parkway: Construction scheduled to begin August 2014
  • El Mirage Traffic Interchange: Construction scheduled to begin early 2015
What to Expect

ADOT will maintain freeway-to-freeway connectivity and will always strive to minimize effects of construction on the motoring public, local residents and businesses. Please allow extra travel time through work zones and plan for these possible conditions:

  • 35 mph speed limit in active work zones
  • Short- and long-term road or intersection closures with detours
  • Temporary bypasses or travel-lane shifts
  • Single-lane restrictions
  • Increased heavy-truck and construction-related traffic
  • Flaggers or law-enforcement officers temporarily stopping or directing traffic
  • Full-road closures if highly impactful construction activity is underway
    • Approved detours will be in place to ensure continued traffic flow.

ADOT will provide advance notification of full closures or significant restrictions that affect drivers or the community, as well as information about detour routes. For detailed information on weekly construction-related closures and restrictions, check the Traffic Alerts page.