CO 119 Bus Rapid Transit (BRT) Project

The CO 119 Safety and Mobility Improvements Project, a joint project between CDOT and RTD, is designing improvements to make traveling through the corridor safer for all modes and transit travel faster and more reliable. RTD is partnering with the Colorado Department of Transportation (CDOT) and Boulder County to integrate the CO 119 BRT project with other active multimodal projects on the corridor to ensure community members can safely and reliably travel throughout the corridor using their mode(s) of choice. Funding has been secured for implementation of the project and a Construction Manager/General Contractor (CM/GC delivery method) will be used to build the project with construction scheduled to start in 2024.

What is Bus Rapid Transit?

Bus Rapid Transit (BRT) is an innovative, high-capacity, lower-cost public transit solution that can achieve the performance and benefits of more expensive rail modes. This service has been designed to transport passengers quickly and efficiently to their destinations, while offering the flexibility to meet a variety of local conditions.

BRT system elements can easily be customized to community needs and incorporate state-of-the-art, low-cost technologies that attract more passengers and ultimately help reduce overall traffic congestion.

The CO 119 BRT project includes:

• BRT/queue bypass lanes at signalized intersections along Diagonal Highway
• Coffman Street busway
• Improved transit stops in Boulder/Longmont
• Bikeway along corridor
• A new Park-n-Ride near US 287 and CO 66 in north Longmont

Learn more about construction impacts here.

Sunday, Oct. 27 to Saturday, Nov. 2, there will be daily, intermittent shoulder closures along CO 119/Diagonal between Hover Street and Colorado Highway 157/Foothills Parkway to install in-ground construction signs.

Beginning at 7 a.m. Monday, Oct. 28, crews will close 71st Street, between Monarch Road and CO 119/Diagonal Highway, near the business park, to all modes of transportation. This seven-month closure will last through May 2025.

Motorists using 71st Street to get to CO 119/Diagonal Highway will follow posted detour signs for alternate access:

• Those traveling southbound on 71st Street should continue east on Monarch Road for access to southbound CO 119.

Businesses can access their properties by using Monarch Road at CO 119/Diagonal Highway. This closure is required for crews to safely tie in new southbound CO 119 to the existing CO 119 infrastructure.

The overnight closure of Niwot Road at CO 119/Diagonal Highway planned for Oct. 28 – 29 has been postponed to a later date.

The closure of eastbound Jay Road at CO 119/Diagonal Highway planned for Nov. 1 – 4 has also been postponed to a later date.

Motorists are experiencing travel delays due to a temporary lane closure at the intersection of Jay Road and CO 119/Diagonal Highway. The project team is aware of the delays and continues to monitor the intersection. The Jay Road intersection will remain in this configuration through early 2025, and the project team advises that travelers take alternate routes at this time.