Project Overview

I-25 Express Lanes
Now Open!

completed i 25 express lanes

In the spring, the High Performance Transportation Enterprise (HPTE) and CDOT announced the opening of both the northbound and southbound I-25 Express Lanes to traffic. The lanes go to 120th Avenue from the existing Central 1-25 Express Lanes in Denver, which ends at US 36.

Travelers will be able to drive in the lanes for free and learn how to use them until toll collection begins July 12, 2016.

Once testing is complete, drivers can choose to ride a bus, pay a toll as a single driver, or carpool for free with one other person and an ExpressToll account and pass. The three adjacent general purpose lanes will also be free.

In October 2013, the Colorado Department of Transportation (CDOT) began a safety and mobility project on a 6-mile segment of I-25 between US 36 and 120th Avenue. The project 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. In addition, the project resurfaced the existing lanes along this 6-mile stretch.

The new Express Lanes connect directly with the existing I-25 Express Lanes leading into and out of downtown Denver, providing motorists with the option of carpooling or paying a toll for a faster, more reliable commute, or utilizing the existing general-purpose lanes for free.

Flatiron Constructors Inc. is the contractor for this project, which is scheduled for completion in summer 2016.


As of June 2016, the project is approximately 95 percent complete.

All mainline paving and overhead sign structure installation is complete. Current and upcoming work is focused on grinding, lane striping, shoulder backing and sound wall construction. Grinding is a pavement-preservation technique that restores ride ability by removing surface irregularities caused during the construction process. Another considerable effect of grinding is the improvement in skid resistance, noise reduction and safety of the surface.

Sound Wall Update

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. Construction of new sound walls along southbound I-25 is underway between 120th Avenue and Thornton Parkway. These walls are expected to be complete by the end of June.

Please note: All work is weather dependent and schedules are subject to change.

Working Hours and Impacts

  • Normal working hours: 5:30 a.m. - 4:30 p.m., Monday through Friday (no lane closures).
  • Night work: Double lane closures weekdays from 10 p.m. - 5:30 a.m. Some night work on Fridays as well as weekend work will take place as needed.
  • Safety note: Do not cross into closed lanes on I-25. Lanes are closed at night to accommodate large, heavy construction equipment, and to do lane striping and grinding work.
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