Interstate 17 (Black Canyon Freeway) Auxiliary Lane Improvements

The Arizona Department of Transportation (ADOT), in cooperation with the Federal Highway Administration (FHWA), initiated an interim improvement project on Interstate 17 from the I-10/I-17 "Split" Interchange to 19th Avenue. Growing traffic demand has caused the I-17 corridor from the Split Interchange to 19th Avenue to become increasingly congested. This project will construct auxiliary lanes between the mainline on- and off-ramps to improve operations by providing additional length for traffic weaving movements in this corridor, while also minimizing the reconstruction of I-17.

I-17 Black Canyon Freeway Auxiliary Lane Improvement Map

Project Elements

This interim improvement project will do the following: 

  • Add auxiliary lanes on I-17 from 19th Avenue to 16th Street
  • Replace the median lights with LED luminaires
  • Construct new retaining walls
  • Widen bridges associated with the auxiliary lanes
  • Construct new northbound right-turn lane on 19th Avenue and an eastbound right-turn lane on the frontage road to mitigate traffic backups


  • The project is currently on hold

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Submit questions and comments or request information in any of the following ways:

  • By Phone: ADOT English/Spanish Project Information Line: 855.712.8530
  • Online: Visit and select Projects from the drop-down menu
  • By Mail: ADOT Communications, 1655 W. Jackson St., MD 126F, Phoenix, AZ 85007