Studies and Programs

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 – September 19, 2013
Contact Us

Any questions or comments related to the ADOT Climbing and Passing Lane Prioritization Studycan be directed to the ADOT Project Manager:

Matt Carpenter
Arizona Department of Transportation
Project Manager
206 S. 17th Ave.
MD 310B
Phoenix, AZ 85007
Phone: 602.712.7870
Fax: 602.712.3046
Tony Staffaroni
Arizona Department of Transportation
Community Relations Project Manager
1655 W. Jackson St.
MD170F
Phoenix, AZ 85007
Phone: 602.245.4051 


From the ADOT Blog

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 ...