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

  • Restriping and other work to take place during the nights only with at least one lane open.  Project to take up to a month to complete, with work beginning in mid to late October.  
  • For the first few nights of construction, crews will place a concrete barrier along the shoulder area of southbound I-225 where it splits off at I-25 to restrict traffic coming from DTC Blvd., East Quincy Ave. and Yosemite St. to northbound I-25. 
  • Crews will restripe southbound    I-225 the remaining nights, turning the shoulder into a lane.
  • CDOT signs will 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. I-25 southbound is not expected to be impacted.
  • Drivers should watch for slightly more narrow lanes.
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.


    • the shoulder to a lane will reduce traffic delays by 50 percent.
    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 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.

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