Transportation Studies

Interstate 10 Improvement Study

I-10 Near-Term Improvements

The Arizona Department of Transportation (ADOT), in cooperation with the Federal Highway Administration (FHWA), has initiated a Design Concept Report (DCR) and environmental study to evaluate near-term freeway capacity improvement options on I-10 from the State Route 143 to the Loop 202 (Santan Freeway).

Study Process

The purpose of this study is to prepare a DCR and environmental document to evaluate near-term freeway capacity improvement options and select a preferred alternative that meets the goals of the Regional Transportation Plan Freeway Program (RTPFP), satisfies the requirements of the National Environmental Policy Act (NEPA), and obtains public support. Design alternatives and potential impacts will be evaluated and considered for this study. The DCR will include a preliminary design concept for the recommended improvements. Potential environmental impacts will be documented following the requirements of the National Environmental Policy Act (NEPA).

Study Purpose

Growing traffic demand has caused the I-10 corridor between SR 143 and Loop 202 (Santan Freeway) to become increasingly congested during the morning and evening peak travel periods, and traffic volume projections indicate the congestion will worsen in the future. This study is meant to develop and evaluate near-term freeway improvement options to accommodate the growing traffic demand.

Initial Concept for Improvements

You are encouraged to provide study-related comments and questions so they can be considered by the project team and addressed in the DCR and draft environmental document. The initial concept for improvements includes these elements:

  • Reconfigure the I-10 / SR 143 Traffic Interchange (TI) and I-10 / US 60 TI ramps at the Broadway Curve: This concept would reconfigure the interchange ramps between SR 143 and US 60 to separate the ramp traffic from the I-10 mainline traffic, thereby eliminating the current weaving maneuvers that contribute to severe congestion on the Broadway Curve corridor during peak travel periods.
  • Construct additional general-purpose travel lanes in each direction between US 60 and Ray Road: Add one general-purpose travel lane on outbound I-10 between US 60 and Ray Road, and one general-purpose travel lane on inbound I-10 between Baseline Road and Ray Road. Auxiliary lanes would be provided in each direction between successive entrance and exit ramps.
Related Studies

Additional freeway improvement studies within the I-10/I-17 corridors include the Maricopa Association of Governments (MAG), study of the I-10/I-17 corridor, called the Spine Corridor Master Plan. The Spine Study, being performed in partnership with ADOT and FHWA, will analyze various long-term strategies to improve mobility in the corridor. The second study, by ADOT in partnership with FHWA and MAG, is called the I-17 Near-Term Improvements Auxiliary Lanes (I-10/I-17 Split Interchange to 19th Avenue) study, which will analyze freeway operational improvement options on the I-17 corridor. All three studies will be conducted through separate efforts, but will integrate information gathered for recommended overall corridor improvements. Additional information on the SPINE study can be found by visiting the MAG Web page or by calling 602.759.1916. Information pertaining to the I-17 Near-Term Improvements Auxiliary Lanes study can be found on the ADOT project Web page or by calling 855.712.8530.

In 2015 public comments were submitted through the following methods:

  • Online
  • Mail: c/o ADOT Community Relations:
    1655 W. Jackson St., MD 126F
    Phoenix, AZ 85007
  • Email:
  • Phone: 855.712.8530
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