I-25 Express Lanes

I-25 Express Lanes


Have you been thinking about getting a Switchable HOV Transponder? Now is the time! Switchable HOV Transponders allow you to carpool for free in the I-25 and US 36 Express Lanes with three or more people in your car.

The way that sales tax is calculated in Colorado changed on Jan. 1, 2019. To reflect this change, the price of Switchable HOV Transponders will increase from $15 to $18 beginning June 5, 2019. If you only carpool, you can still get the pass for free.

If you have a question about what pass works for you, click here.

All carpoolers who use the HOV lane on I-25 must have three people in the vehicle to travel for free.

What You Need to Know

The North I-25 Express Lanes are available 24 hours a day. However, they connect to the existing Central I-25 Express Lanes, which are reversible lanes that are open in certain directions at different times of the day. As part of this project, there is a new connection to the existing Express Lane section that forces southbound traffic back on I-25 by 70th Street when the reversible lanes are northbound.

Note: Vehicles should not cross the solid white line to access the Express Lane. Enter and exit at the designated areas only, shown with a white dotted line.

Northbound travelers: There are three northbound entries to the new Express Lane. Similar to the I-70 Mountain Express Lane, one toll is charged for the entire section. (CDOT wants to encourage throughput and will charge one price for the whole section, no matter where the driver enters.) From northbound I-25, there are three entrances: before 84th Avenue, before Thornton Parkway, and before 104th Avenue.

Southbound travelers: There are three entrances to the southbound I-25 Express Lanes: after 120th Avenue, before Thornton Parkway, and before 84th Avenue. Entrances to the existing Express Lanes to Denver are at the I-270 exit ramp. (There’s another chance to enter right after the I-270 exit.)

US-36 to I-25 travelers: If you are driving from the US-36 Express Lanes to the northbound North I-25 Express Lane, take Exit 0 to North I-25, then gradually merge to the left to access the North I-25 Express Lanes just before 84th Avenue.

Solo travelers: If you plan to use the Express Lane as a tolled vehicle, be sure to get a pass to receive the discounted toll rate.Go to www.expresstoll.com to get the pass that is right for you. The ExpressToll passes (stickers or switchable transponders) work on CDOT’s Central Express Lanes, US-36, I-70 Mountain Corridor, E-470, the Northwest Parkway, and the North  I-25 Express Lanes. Travelers will be charged the toll price posted when they entered an Express Lane. If the price should increase or decrease while they are in the lane, drivers will pay the price posted upon entry. 

Carpoolers/HOV travelers:  If you plan to use the Express Lane for free as a three-person carpool, you need to have a Switchable HOV Transponder.  If you do not have this transponder, you will be charged either a license plate toll or an AVITOLL (for cars registered at expresstoll.com) regardless of how many passengers you have in your vehicle.


About the North I-25 Express Lanes Project

The North I-25 Express Lanes used existing infrastructure to expand the capacity of I-25 for six miles (from US-36 to 120th Avenue) by adding an Express Lane in each direction on the inside shoulders. In addition, the project resurfaced the existing lanes in this six-mile stretch, lowered the profile of I-25 under the 88th Avenue bridge to increase truck traffic safety, reconstructed the connection area of the existing Express Lanes and their ramps to I-25, constructed new concrete noise barriers, and installed new highway signage that includes CDOT’s Active Traffic Management system to alert drivers of incidents. Construction began in 2013, and the lanes opened for tolling in July 2016.

About Express Lanes

Express Lanes increase roadway capacity and help to manage congestion on the highways. The use of toll pricing during peak travel times reduces delays, manages congestion, and maintains reliable travel times. For more information, visit expresslanes.codot.gov

About the High Performance Transportation Enterprise (HPTE)

The HPTE operates as a government-owned, independent business within CDOT. It searches for innovative ways to finance projects to help Colorado fulfill its commitment to increase travel choices through options that include Express Lanes, transit, biking, walking, and carpooling. For more information, visit www.coloradohpte.com.

For more information on the North I-25 Express Lanes, go to www.codot.gov/projects/I25NorthExpressLanes.