I-70 Mountain Express Lane

Project Status: Complete

aka, Eastbound Peak-Period Shoulder Lane

I-70 Mountain Express Lane entry sign

The I-70 Mountain Express Lane project upgraded 13 miles of eastbound I-70 within CDOT's existing right-of-way. This work created a wide shoulder that operates as a third travel lane along eastbound I-70 from Empire through the Veterans Memorial Tunnels to Idaho Springs.

Rather than being open all the time, the lane is open for up to 100 days per year when the highway experiences the highest traffic congestion (primarily holidays and weekends). This provides much-needed relief to the busiest recreation highway in the state. When the lane is not open, the overhead signage indicates that it's closed and is being used as a shoulder.

Since opening in December 2015, the Mountain Express Lane has relieved traffic congestion, diverting 750 to 900 cars from the free general-purpose lanes. This alleviates traffic congestion in the Express Lane, and decreases congestion in general-purpose lanes and frontage roads. The lane reduces travel time by nearly half from the Eisenhower/Johnson Memorial Tunnels to the top of Floyd Hill, resulting in an average time savings of 30 minutes.

CDOT, local communities and travelers are benefitting from the I-70 Mountain Express Lane via decreased travel times and faster, more consistent speeds. The lane has also helped reduce congestion due to traffic incidents.

Contact Us
  • Media Contact:
    Stacia Sellers
    Communications Specialist
    Email Stacia.
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


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