Southbound I-225 Restriping & Lane Addition from Yosemite Street to I-25

Access Restrictions

Southbound I-25 will be inaccessible to drivers on southbound I-225 coming from DTC Boulevard, East Quincy Avenue and Yosemite Street. Instead, these drivers will be restricted to one lane that flows onto northbound I-25. This prohibits drivers from weaving across southbound I-225 to enter southbound I-25, improving safety and traffic flow.

CDOT is conducting a pilot project to reduce congestion on southbound I-225 in the Denver Tech Center (DTC) area by converting the shoulder into an additional lane. This will be done by restriping less than a mile of southbound I-225 from Yosemite Street to I-25.

Schedule & Traffic Impacts

  • Construction will be done nights only on southbound I-225, with at least one lane open to traffic. Work is expected to begin in late October and last up to a month.

  • Crews will first place a concrete barrier along the shoulder on the right side of the DTC on-ramp and southbound I-225 where it splits off at I-25.
    • This shoulder will operate as a lane taking on-ramp traffic from DTC Boulevard, Yosemite Street and E. Quincy Avenue to northbound I-25.
    • This traffic will not be able to weave across southbound I-225 to take southbound I-25.
    • The barrier installation will take place the first few nights of construction; this barrier will remain throughout the pilot project (one year and longer if the project operates successfully).
  • Crews will restripe southbound I-225 the remaining nights.

  • CDOT will install signs to warn motorists of upcoming construction and new traffic patterns.

  • With better traffic flow on southbound I-225, traffic will enter northbound I-25 more quickly, which may slightly increase northbound congestion. Southbound I-25 is not expected to be impacted.

  • Drivers should watch for slightly more narrow lanes.

  • Improved traffic flow on southbound I-225 is anticipated to reduce cut-through traffic on local roads in the DTC area and Greenwood Village.
A faster trip on southbound I-225: Converting the shoulder to a lane from Yosemite Street to I-25 is expected to cut traffic delays by half on one of the most congested roads in Denver.


  • Cut traffic delays in half
    With traffic back-ups extending over three miles on southbound I-225 during peak travel times, CDOT estimates that converting the shoulder to a lane will reduce traffic delays by 50 percent.
  • Cost-efficient and fast construction
    The cost of this project is less than $1 million, and the work will take up to a month to complete—as compared to spending $65 million to build additional lanes and rebuild bridges, which would take a couple of years to complete. The restriping is a pilot project, and it will be evaluated and monitored for effectiveness.

Join us for a Facebook Live broadcast to discuss this important project:

Contact Us
  • CDOT Customer Service

Subscribe to project alerts


Colorado: The Official State Web Portal