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ADOT completes SR 347 interim safety improvements

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In October, the Arizona Department of Transportation installed two flashing signals on State Route 347. This was the final piece of several interim improvements resulting from a 2023 Road Safety Assessment on the corridor between Interstate 10 and the northern Maricopa area.

ADOT crew completed installation of the flashers at Riggs Road

The new flashing signals, located both north- and southbound in advance of the Riggs Road intersection, will begin flashing three seconds prior to the upcoming traffic signal turning yellow and continue flashing until the light turns back to green. This measure is intended to give drivers more time to react to the upcoming signal change in an effort to reduce the number of rear end crashes at these intersections. ADOT’s Regional Traffic Engineering group will evaluate the performance of these signals over time and further develop guidelines for their use.

These flashing signals are currently in place along US 93 north of Kingman, and at SR 87 and Fort McDowell Road. However, the new ones on SR 347 will be the first solar-powered, wireless flasher system.

Pictured left: ADOT crew completed installation of the flashers at Riggs Road.

The additional interim improvements made over the last several months include:

  • Four existing median crossovers were refreshed, and a new median crossover was created for emergency vehicles.

    Pictured right: A refreshed median crossover along SR 347.
    Click image to enlarge.
refreshed median crossover along SR 347
  • The following areas were re-striped to add or extend turn lanes: Queen Creek Road/I-10 interchange and intersections at Riggs Road, Casa Blanca Road, Old Maricopa Road, and Mammoth Way (also known as Cement Plant Access Road).

    Pictured right: Restriped, lengthened turn lane at SR 347 and Casa Blanca Road.
    Click image to enlarge.
SR 347 lengthened turn lane photo
  • Speed limit signs were removed that previously reduced the speed limit from 65 mph to 55 mph approaching intersections, making the corridor 65 mph between I-10 and the city of Maricopa. 
  • A new signal pole and head were installed at the eastbound I-10/Queen Creek Road off-ramp to allow the signal phasing to be optimized and reduce queuing on the off-ramp. 
  • Traffic signal timing was adjusted, and will continue to be monitored and adjusted as needed in the future. 
  • Reflective signal head backplates were installed. 
  • Traffic signs were added or replaced at various intersections. 
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SR 347 Corridor Projects

SR 347 Corridor Projects

Contents

ADOT has several planned improvement projects on the State Route 347 corridor between Interstate 10 and State Route 238 in the city of Maricopa. This segment of SR 347 is located primarily within the Gila River Indian Community (GRIC). Therefore, all studies and projects are being coordinated with GRIC, in accordance with federal and state regulations. Additional partners on these projects, depending on location, may include: the Maricopa Association of Governments (MAG), the Bureau of Indian Affairs, Maricopa County Department of Transportation, Pinal County and the city of Maricopa.

Projects Area Map

SR 347 project corridor map
Click map to enlarge.

 

Riggs Rd Traffic Interchange at SR 347

Project Elements: Constructs a new interchange to fully separate traffic on SR 347 and Riggs Road to improve traffic flow and safety. ADOT is currently conducting an environmental study and Design Concept Report (DCR) to evaluate interchange alternatives and select a preferred alternative.

Anticipated Schedule: The study will conclude in late 2024 and design is expected to begin in early 2025. Construction is anticipated to begin in late 2027 and take approximately 12-18 months to complete.

Funding: This project is funded for construction.

More info: https://azdot.gov/planning/transportation-studies/riggs-road-traffic-interchange-sr-347

 

SR 347 Widening, I-10 to city of Maricopa

Project Elements: Adds one lane in each direction on SR 347 from I-10 to the city of Maricopa and makes intersection improvements for traffic flow and safety.

Anticipated Schedule: This project is currently in the preliminary design phase and is not currently funded.  However, the northern portion, from I-10 to Riggs Road, is included in the project list of the recently-approved half cent sales tax extension in Maricopa County.    

Funding: This project is not currently funded for construction.

More info: https://azdot.gov/projects/central-district-projects/sr-347-corridor-widening-i-10-city-maricopa

 

Casa Blanca Road and Mammoth Way Intersections

Project Elements: Modify the intersection layout to improve traffic flow and safety. Will be designed as part of the SR 347 widening project.

Anticipated Schedule: This project is in the preliminary design phase, and the team expects to move into the design phase in early 2025.  The estimated construction advertisement date is fall 2025.  

Funding: These intersections are funded for construction.

More info: https://azdot.gov/projects/central-district-projects/sr-347-corridor-widening-i-10-city-maricopa

 

SR 347 Pavement Preservation

Project Elements: Repave SR 347 between I-10 (MP 189.3) and Lakeview Drive (MP 175.7) at the northern limits of the city of Maricopa to create a smoother drive and extend the life of the roadway.

Anticipated Schedule: The project is currently in design. Construction is anticipated to begin in late 2026 and take approximately 12 months.

Funding: This project is funded for construction.
 

SR 347 Road Safety Assessment

As the primary route from the city of Maricopa to the Phoenix area, State Route 347 (SR 347) has become a highly traveled corridor. In spring 2023, ADOT completed a safety study on SR 347 between I-10 and the northern city limits of Maricopa. The Road Safety Assessment (RSA) identified potential safety issues related to roadway traffic and evaluated possible ways to improve safety for drivers. Interim improvements based on the assessment were completed in fall 2024.

More info: http://azdot.gov/SR347/RSA
 

John Wayne Parkway (SR 347) Improvements — SR 238/Smith-Enke Road to Maricopa City Limits

Project Elements: Adds a third northbound through lane on SR 347 between SR 238/Smith Enke Road and the northern limits of the city of Maricopa, makes intersection improvements at SR 347/Lakeview Drive and repairs pavement within the project limits.

Anticipated Schedule: This project was completed in May 2024.

More info: http://azdot.gov/johnwayneparkway

 

 

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