Project Overview

The High Performance Transportation Enterprise (HPTE) and Colorado Department of Transportation (CDOT) announced the opening of the northbound North I-25 Express Lane to traffic on Monday, March 14, and the opening of the southbound lane for testing on March 21. The lanes go to 120th Avenue from the existing Central I-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 while toll collection is waived during the testing period.

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. Create an ExpressToll account here, and order your pass today!

I-25 North Express Lanes Flatirons Completed Paving
Completed paving on northbound I-25

Join us for a Telephone Town Hall!

Call in for a Telephone Town Hall to discuss the proposed toll rates for the North I-25 Express Lanes on May 2, 20167-8 p.m. You can dial 877-229-8493 and enter PIN number 111457.


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 will maximize 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 will resurface the existing lanes along this 6-mile stretch.

The new Express Lanes will 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 Spring 2016.


As of February 2016, the project is approximately 90 percent complete.

All mainline paving, and overhead sign structure installation is complete. Current and upcoming work is focused on HOV connectors, final striping, and sound wall construction.

Crews expect the express lanes to be intermittently open to the public by mid March 2016, with paid tolling anticipated in late Spring 2016. From March to May motorists will be able to access the Express Lanes free of charge while CDOT tests the tolling software and equipment.

Although it was originally scheduled for completion in October 2015, the project has been extended so additional sound walls can be put in place.

Sound wall Update

New sound walls have been installed along northbound I-25 between US 36 and 84th Ave, and adjacent to the bike path between 104th Ave. and 120th Ave.

Construction of new sound walls along southbound I-25 is underway between 120th Ave and Thornton Pkwy. These walls are expected to be complete by March.

Please note, all work is weather dependent and schedules are subject to change.

Working Hours and Impacts

Normal working hours are Monday through Friday from 5:30 a.m. to 4:30 p.m., and no lanes will be closed during the day.

Night work, requiring double lane closures, will take place from 10:30 p.m. to 5:30 a.m. Some night work on Fridays as well as weekend work will take place as needed.

Please note: Motorists should not cross into closed lanes on I-25 for their own safety and the safety of the construction team. Lanes are closed at night to accommodate for large, heavy construction equipment and setting time for asphalt, concrete and striping. 

Stay Informed

If you have questions about the project, please leave a message on the project hotline or email us.  You will receive a response within 24 hours on business days. Sign up to receive alerts and updates by clicking on the project updates icon on the right side of this page.
Phone: 303-539-6966
Email:[email protected]


Project Information Line:
E-mail: [email protected]

Andy Stratton, P.E.
CDOT Region 1
Project Manager
[email protected]

Emily Wilfong
CDOT Communications Manager
303 512-5955
[email protected]

Colorado: The Official State Web Portal