US36 Express Lanes

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Colorado Department of Transportation

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Westminster to Boulder, Colorado

Multi-modal transportation in the front range

The US 36 Express Lanes Project provides multi-modal transportation improvements, including additional traffic lanes, HOV/Toll lane, Bus Rapid Transit, and a bike trail along the Denver-Boulder Turnpike for 15 miles from Westminster to Boulder.

With seven interchanges, three bridge replacements, three bridge widenings, and seven Bus Rapid Transit (BRT) Stations this project travels through five municipalities. Developing relationships with each stakeholder was a key component of the project’s success. During the lighting and electrical design, Clanton & Associates coordinated closely with CDOT, RTD, Xcel Energy, and each municipality to determine the needs and requirements of each stakeholder.

Through Westminster and Broomfield, the mainline of US 36 is illuminated with 70’ tall mid-mast lighting that is integrated into the median concrete guardrail and the interchange ramps are illuminated with 35’ tall street lights.

In Boulder County, only the interchange ramps have lighting in the interest of minimizing light pollution and light trespass.

In the City of Westminster, all of the roadway lighting is LED, and the City is coordinating a wireless control system to manage and monitor their lighting.

With Xcel Energy maintaining the lights in Broomfield and unincorporated Boulder County, all of the roadway lighting is high pressure sodium.

Clanton & Associates provided a cost-benefit analysis for the Town of Superior and City of Louisville to help guide their decision to use LED lighting at the McCaslin Blvd interchange. With RTD BRT Stations in each municipality, lighting requirements were coordinated with both RTD and the municipality.

Project Scope


Electrical Engineering


Clanton & Associates has developed street and pedestrian lighting master plans, lighting criteria, tours, pilot demonstrations, surveys, lighting measurements, and lighting research projects. Our extensive experience in creating street lighting master plans and guidelines for cities, assists our clients in making informed decisions regarding street lighting design to plan for the future of smart cities.