Mobility in the Corridor

Northwest area stakeholders have established a multimodal vision whereby people can safely and reliably access and move throughout the corridor by walking, bicycling, riding transit, and driving. This multimodal corridor vision was established through the CO 119 Multi-Modal Planning and Environmental Linkages (PEL) Study, which identified numerous project elements being advanced as separate projects by corridor stakeholders.

The CO 119 Safety and Mobility Project is being designed to integrate with these other projects on the Corridor:

Project Map

The projects’ southern boundary is Foothills Parkway in Boulder. The northern boundary is Hover Street in Longmont. The planned BRT service extends beyond the corridor from downtown Boulder to Colorado Highway 66 north of Longmont.

CO 119 Corridor Projects map

(Click image to enlarge)

Coordination Across Projects

The CO 119 leadership structure streamlines project development so projects are advanced in an efficient and cost-effective manner. Representatives from all organizations with active planning projects on the corridor between 2020 and the present meet monthly to ensure project coordination.  

Leadership structure image

(Click image to enlarge)

Community Advisory Committee

Boulder County, Colorado Department of Transportation, and the Regional Transportation District are jointly hosting a community meeting to share the preliminary design plans for the CO 119 Safety and Mobility Project and CO 119 Bikeway Design Project. Design elements include bus queue bypass lanes, Bus Rapid Transit (BRT) stations, Park-n-Rides, a commuter bikeway, improved pedestrian crossings, and intersection improvements, including physically reconfiguring CO 52 and changing access at Airport Road and CO 119. During the meeting, the project team will present the design plans and show how the two projects work together to improve safety and enhance multimodal connectivity on the corridor.

Early Planning Studies

Boulder County is one of the fastest growing areas of Colorado and area stakeholders have long advocated for improved transit to accommodate new residents and businesses. In 2014, RTD completed the Northwest Area Mobility Study (NAMS), which focused on developing consensus among RTD, CDOT, and northwest area stakeholders on cost-effective, immediate-term mobility improvements that address growing travel demand and improve mobility in the northwest region. NAMS identified the CO 119 corridor from Boulder to Longmont as a top candidate for prioritized transit service.

In 2017 RTD commissioned the CO 119 Multi-Modal Planning and Environmental Linkages (PEL) Study to implement the NAMS recommendation of optimizing regional connectivity and mobility between and within Boulder and Longmont by providing improvements that result in faster and more reliable transit travel. Whereas NAMS recommended a single Bus Rapid Transit route for the corridor, the PEL Study process determined that mobility improvements should encompass a multimodal corridor vision. To implement this vision, the PEL Study identified numerous project elements, including a commuter bikeway and first and final mile connectivity, which are currently being advanced as separate projects by corridor stakeholders.

In reviewing the PEL Study, the Federal Highway Administration and Federal Transit Administration determined that a detailed traffic analysis is necessary before design could begin on the safety and highway capacity management improvements associated with the CO 119 Safety and Mobility Project. To meet this requirement, the Colorado Transportation Investment Office (CTIO) (previously HPTE) commissioned the Traffic Alternatives Study.
Project Development Process graphic

The Colorado Transportation Investment Office (CTIO) (previously HPTE) commissioned the Traffic Alternatives Study, a cost benefit analysis to identify the highway capacity management and transit priority improvements that best advance the SH 119 Multi-Modal Planning and Environmental Linkages (PEL) Study goals:

  • Improving safety in the whole corridor
  • Maximizing intersection operational efficiency
  • Maximizing corridor-wide efficiency
  • Maximizing the number of people able to move through the corridor
  • Improving transit travel times
  • Improving connectivity to the bicycle and pedestrian network

The Traffic Alternatives Study analyzed 7 alternatives for year 2045 conditions:

  • No Build
  • Baseline (intersection improvements at CO 52, Hover, and Airport)
  • Queue Bypass Lanes
  • 3 General Purpose Lanes
  • Tolled Express Lane (adding a new lane)
  • Tolled Express Lane (converting existing lane to tolled express lane)
  • Tolled Express Lane (grade-separated)

Safety was assessed by reviewing crash improvements, pedestrian exposure, bike exposure, and intersection and segment conflict points. Cost was added as an additional scoring element. Scores were weighted for safety, operations, and cost.

Study Findings:

  • Intersection Improvements and Queue Bypass Lanes tie for the highest score.
  • Intersection Improvements (the Baseline) significantly improves corridor performance compared to the No-Build Alternative.
  • Queue Bypass Lanes alternative is low cost and provides Bus Rapid Transit travel time savings and trip reliability.
  • Tolled Express Lane Scenarios provide similar Bus Rapid Transit travel time savings and trip reliability as Queue Bypass Lanes, but at a significantly higher cost. Additionally, these scenarios increase the number of personal vehicles served in the corridor.


Intersection Improvements and Queue Bypass Lanes are recommended to be advanced for design and implementation through the CO 119 Safety and Mobility Project.

Read the full Traffic Alternatives Study report here.

Stakeholder Collaboration:

Throughout the Traffic Alternatives Study, CTIO engaged all planning partners in the corridor including Boulder County, City of Boulder, City of Longmont, Commuting Solutions, Federal Highway Administration, RTD, and CDOT. Each of the corridor planning partners provided input and helped to guide the study process. The study’s findings were reviewed and discussed by the CO 119 leadership structure. This collaborative process led to the concurrence of the recommendations by all planning partner stakeholders. This level of collaboration provides a solid foundation for the CO 119 Safety and Mobility Project to move forward to design.