Eastbound I-70 Peak Period Shoulder Lane


The project, part of CDOT’s comprehensive plan to improve travel in the I-70 Mountain Corridor, will upgrade 13-miles of Eastbound I-70 within CDOT’s existing right of way. The upgrades will create the I-70 Mountain Express Lane; a wide shoulder that – only during peak travel periods – will operate as a third travel lane. The I-70 Mountain Express Lane will be dynamically priced to keep traffic moving. Prices will lower when CDOT wants to encourage drivers to use the lane and rise as the lane reaches capacity. Click here for more information on how express lanes operate.

Utilizing the shoulder to create an express lane within the existing I-70 right-of-way during peak periods instead of adding a full lane has several benefits:

Project Benefits

  • Dynamic toll pricing keeps traffic moving: prices lower to encourage drivers to use the lane and rise as the lane reaches capacity
  • Reduces travel time by nearly half from the Eisenhower/Johnson Memorial Tunnels to the top of Floyd Hill, resulting in an average 30-minute time savings
  • Provides drivers with the choice of a new more reliable travel lane
  • Avoids overbuilding I-70, by using the shoulder as a third lane, during peak hours
  • Enhances recent Twin Tunnels (Veterans Memorial Tunnels) improvements
  • Allows for faster speeds in all lanes, thus decreasing overall travel time

Click here to view the weekly lane closure report.

Current Construction Activity:

As a reminder, the I-70 Mountain Express Lane is limited to being open 73 days a year, so it will primarily be open on Saturdays, Sundays and holidays to help alleviate eastbound I-70 traffic volumes during peak travel periods. On all other days, this lane will be used as a shoulder.

Construction work will continue into the spring and will include:

  • Additional fiberoptic splicing work throughout the corridor.
  • The installation of additional signs throughout the corridor.
  • Grading and paving work at each of the on-ramps and off-ramps in the Exit 241 interchange to tie in the new, taller bridge structure with the I-70 lanes.
  • Additional work to install glare screens on the I-70 center median barrier.
  • Improvements in Water Wheel Park that will include new retaining walls, a redesigned plaza area, improved creek access and native vegetation landscaping.
  • Asphalt plug work at each of the seven bridges along the project corridor.
  • Final seeding and landscaping work.
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How will the I-70 Mountain Express Lane Work?

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Fall 2015: Express Lane Closed

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Fall 2015: Express Lane Open

Stay Informed?



Click here to view the weekly lane closure report


Bilingual Project hotline: 303-223-6581


Have a question? Click here to contact the project team

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Planning a Trip?

Slower speeds in construction zones may temporarily delay travel times.  We want to make sure you have access to events, trails and towns that make Colorado great. Use the resources below to help you prepare:

  • Sign up for free email and text alerts with CDOT’s GovDelivery service
  • Call the project hotline (303-223-6581) to listen to the most recent lane closure report
  • Visit
Colorado: The Official State Web Portal