Transportation Studies

Southcentral District I-10 Corridor Ramp Operations Study

Study Overview

Interstate 10 within the Southcentral District has undergone a number of changes over the past 10 years.  Between Twin Peaks Road and 22nd Street, there are several reconstruction projects along the corridor, including I-10 mainline reconstruction from 29th Street to Prince Road and newly reconstructed traffic interchanges including Twin Peaks Road, Prince Road, and Ina Road (underway).  In the near future, Ruthrauff Road interchange will also be reconstructed, along with Mainline I-10 in between Ina Road and Ruthrauff Road.  This section of I-10 has been reviewed individually but not as a system particularly with regard to ramp metering and frontage road operations.  A similar study was completed in 2003 but predated the major reconstruction of I-10 in 2009. The traffic operations of these facilities have changed significantly due to the change in roadway geometrics and increased traffic volumes.

The primary goal of this study is to determine current and future traffic control needs for the I-10 corridor between Twin Peaks Road and 22nd Street.  This study will determine if and when the ramp metering infrastructure should be utilized and how it would operate.  In addition, this study will re-evaluate the traffic control at the frontage road junctions to determine if the systematic “yield” control is appropriate or if “stop” control should be provided.  The result of this study will provide the basis for future ramp metering design projects and provide operational insight and direction on the frontage road operational controls.

Contact Info

For additional info about the study, please contact the ADOT Project Manager Mark Hoffman at 602.712.7454 or at

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Civil Rights

Pursuant to Title VI of the Civil Rights Act of 1964, the Americans with Disabilities Act (ADA) and other nondiscrimination laws and authorities, ADOT does not discriminate on the basis of race, color, national origin, sex, age, or disability. Persons that require a reasonable accommodation based on language or disability should contact ADOT’s Civil Rights Office at Requests should be made as early as possible to ensure the State has an opportunity to address the accommodation.

De acuerdo con el Título VI de la Ley de Derechos Civiles de 1964, la Ley de Estadounidenses con Discapacidades (ADA por sus siglas en inglés) y otras normas y leyes antidiscriminatorias, el Departamento de Transporte de Arizona (ADOT) no discrimina por motivos de raza, color, origen nacional, sexo, edad o discapacidad. Las personas que requieran asistencia (dentro de lo razonable) ya sea por el idioma o discapacidad deben ponerse en contacto con la Oficina de Derechos Civiles de ADOT en Las solicitudes deben hacerse lo más antes posible para asegurar que el Estado tenga la oportunidad de hacer los arreglos necesarios.