Transportation Studies

Climbing and Passing Lane Prioritization Study

Project Summary

Passing and climbing lanes provide additional lanes for vehicles to safely pass other vehicles while maintaining speeds. Implementing passing and climbing lane projects provides traffic operational and safety benefits at a cost that is far less than fully widening a highway. In an effort to enhance safety and mobility on Arizona's roadways, the Arizona Department of Transportation is currently updating the 2003 Passing and Climbing Lanes Prioritization Study. This update intends to further refine the identification and prioritization methodology previously utilized and to develop a prioritized list of candidate locations that would provide the most benefit to the traveling public.

Study Objectives
  • Review previous studies and research current best practices.
  • Analyze the safety and performance benefits of passing/climbing lanes constructed since the previous study.
  • Develop a revised methodology and ranking criteria.
  • Obtain feedback from ADOT District Engineers and other stakeholders, such as rural COGs and MPOs.
  • Develop a new prioritized list of candidate passing/climbing lane projects. 
Scope of Work
Technical Advisory Committee (TAC)
Meeting: June 6, 2013
Meeting: Sept. 19, 2013
Final Report
Contact Us

Any questions or comments related to the ADOT Climbing and Passing Lane Prioritization Study can be directed to the ADOT project manager.

Justin Feek
Arizona Department of Transportation
Project Manager
206 S. 17th Ave.
MD 310B
Phoenix, AZ 85007
Phone: 602.712.6196
Fax: 602.712.3046

From the ADOT Blog

A climbing lane on SR 87
Transportation Defined: Climbing Lanes

Jan. 29, 2013

Next time you're traveling uphill only to get stuck behind a slow-moving vehicle or truck, you'll appreciate the concept of a climbing lane ... Full story ...

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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.