North I-25 Express Lanes: US 36 to 120th Avenue

About the Express Lanes

View the Toll Rates.

completed i 25 express lanes

In spring 2016, the High Performance Transportation Enterprise (HPTE) and CDOT opened both the northbound and southbound I-25 Express Lanes between US 36 and 120th Avenue. The lanes extend the existing Central 1-25 Express Lanes in Denver, which end at US 36.

Testing was completed and tolling began in spring 2016. Drivers can choose to ride a bus, pay a toll as a single driver, or carpool for free with an ExpressToll account and Switchable HOV Transponder. The three adjacent general purpose lanes continue to be free.

In October 2013, the Colorado Department of Transportation (CDOT) began a safety and mobility project on a six-mile segment of I-25 between US 36 and 120th Avenue.

Project Benefits

  • Maximizes the use of the existing highway infrastructure to expand the capacity of I-25 by adding one HOV/tolled Express Lane in each direction
  • Resurfaced the existing general purpose lanes along this six-mile stretch
  • Connect directly with the existing I-25 Express Lanes, leading into and out of downtown Denver
  • Provides motorists the option of carpooling or paying a toll for a faster, more reliable commute, or using the existing general purpose lanes for free


This project is now complete.

See information about the current project to extend North I-25 Express Lanes from 120th to the Northwest Parkway/E-470.

Sound Walls

New sound walls have been installed along northbound I-25 between US 36 and 84th Avenue, and adjacent to the bike path between 104th and 120th avenues. New sound walls have also been constructed along southbound I-25 between 120th Avenue and Thornton Parkway.