CDOT to begin improving Greenland Road interchange for I-25 South Gap project

July 17, 2019 - Work requires a new traffic pattern; significant safety measures in place on the corridor

From 6 p.m. Wednesday, July 17 through 6 a.m. Thursday, July 18, crews will close one lane of northbound I-25 at the Greenland Road interchange as they rebuild the road into a two-lane underpass, as well as build a wildlife crossing north of Greenland Road.

Travelers can expect delays from 6 to 9 p.m. Motorists will drive the completed configuration starting on Thursday, July 18. All construction schedules are weather-dependent.


Part of the I-25 South Gap project and CDOT's Whole System-Whole Safety program, this work will require a new traffic pattern called a crossover on I-25 at the Greenland Road interchange so crews can safely do the work. Drivers will still have ramp access, but the northbound ramps will shift a quarter-mile to the south. Two lanes will remain open in each direction on I-25 during daytime and high-peak travel periods.

Safety Tips for Driving the Crossover

  • When driving the crossover, slow down, stay alert, exercise caution and watch for crews.
  • Expect a significant grade change in the area; please pay extra attention when driving.
  • Stay the course, but plan a little extra time to get to your destination.
  • Do not speed in work zones; obey the posted speed limits.
  • Don't change lanes unnecessarily.
  • Avoid using mobile devices such as phones while driving in work zones.
  • Turn on headlights so that workers and other drivers can see you.
  • Be especially alert at night while driving in work zones.
  • Expect delays, especially during peak travel times.
  • Allow ample space between you and the car in front of you.

  • Anticipate lane shifts, and merge when directed to do so.
  • Be patient.

Stay Informed

The following safety measures have been implemented on the project:

  • Reduced speed limit to 60 mph, and installed Portable Variable Speed Limit Signs. These boards allow the project to adjust the speed limits in real-time based on weather conditions, crashes, or construction-related impacts. With this technology, crews can slow down traffic ahead of a crash, incident or weather impact, possibly reducing the likelihood of secondary crashes.
  • Increased law enforcement by the Colorado State Patrol to cover the project seven days a week, contingent upon CSP resources.
  • Ensure adequate first responder access by providing access breaks in the barrier where possible.
  • Provide shoulder pull-off locations for emergencies.
  • Limit lane closures to off-peak travel periods at night unless emergency situations warrant a lane closure such as road damage repairs or other emergency situations.
  • No detouring traffic to alternate routes, such as CO 83 or CO 105.
  • Dedicated multiple courtesy patrol vehicles to the project, which has helped greatly to get disabled vehicles off the road and traffic moving.
  • Monitor traffic through a project operations center that uses cameras, signs and vehicle detection devices to help with incident management. 
  • Deployed numerous Smart Work Zone systems and devices that warn motorists of backed up traffic, trucks entering and exiting the work zone and other incidents and activities.
  • Stage equipment by the contractor prior to large snow events to assist with snow operations and response issues.
  • Hold biweekly meetings with emergency response agency partners to coordinate efforts on project operations and work zone safety.
  • Implemented significant safety improvements on the frontage roads from Larkspur to Castle Rock.
  • Implemented extensive public relations efforts including, text alerts, social media, special media briefing events, paid advertising campaigns, public meetings, weekly e-blasts to stakeholders, regular meetings with stakeholders and elected officials, coordinating seamlessly between two counties.
  • Added Bustang routes and ride-sharing program from Colorado Springs to the Denver Tech Center to give motorists other travel options during construction.
  • Provide extra lane for the Renaissance Festival to help alleviate traffic congestion during this eight-week event.


CDOT has approximately 3,000 employees at its Denver headquarters and in regional offices throughout Colorado, and manages more than 23,000 lane miles of highway and 3,429 bridges. CDOT also manages grant partnerships with a range of other agencies including metropolitan planning organizations, local governments, and airports, and administers Bustang, the state-owned and operated interregional express service. Gov. Jared Polis has charged CDOT to further build on the state's intermodal mobility options. 

CDOT is improving 18 miles of I-25 between Monument and Castle Rock by widening the highway from two to three lanes in each direction. The new lane will operate as an Express Lane, allowing motorists the choice of taking the Express Lane for a faster, more reliable travel time in exchange for a toll. Express Lanes will be free to vehicles with three or more people and motorcycles. All travelers will have the choice of taking the general-purpose lanes for free.

The $350 million project also includes shoulder widening, rebuilding bridges, new wildlife crossings, resurfacing with new pavement and modernizing technology. Project completion will occur in 2022.

Travel options to improve commutes are available during construction. Some of the services include a new Bustang route from Colorado Springs to the Denver Tech Center. CDOT is partnering with the Denver Regional Council of Governments' Way to Go program to provide more commuting options, such as incentives to vanpool and carpool. Visit to learn more.

Whole System, Whole Safety

To heighten safety awareness, CDOT recently announced its Whole System, Whole Safety initiative. This project takes a systematic statewide approach to safety combining the benefits of CDOT’s programs that address driving behavior, our built environment and the organization's operations. The goal is to improve the safety of Colorado's transportation network by reducing the rate and severity of crashes and improving safety conditions for those traveling by all transportation modes. The program has one simple mission: to get everyone home safely.