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Intersection Safety Improvements

Intersection Safety Improvements

The City of Boulder received federal Highway Safety Improvement Program (HSIP) funding from the Colorado Department of Transportation (CDOT) for improvements at three intersections. The purpose of these projects is to reduce crashes between cyclists, pedestrians and motor vehicles and to improve overall safety and comfort at these locations for all modes of transportation.

Colorado Avenue and Regent Drive  

Between 2012 and 2014, the city found that 48 crashes occurred at the intersection of Colorado Avenue and Regent Drive adjacent to the University of Colorado Boulder:
  • 23 of the crashes were rear-ends 
  • 16 of the crashes resulted in injuries 
  • Eight crashes included cyclists
  • Two crashes included pedestrians 
All of these crashes involved turning vehicles. There were three eastbound crashes where a vehicle turned right directly in front of a bicyclist (known as a right-hook), and two crashes involving northbound right-turning vehicles hitting cyclists in the raised crossing. Most of the rear-end crashes (78%) occurred in the northbound right-turn bypass lane. Many involved vehicles getting rear-ended while yielding to eastbound traffic on Colorado Avenue, while some were related to vehicles yielding to pedestrians in the crosswalk across the right-turn lane. Ten crashes, including two bicyclists and one pedestrian, involved westbound left turns.

Proposed intersection improvements include:

  • Install elements of a protected intersection to improve safety for cyclists traveling eastbound through the Colorado Avenue and Regent Drive intersection. 
  • Install a protected bike lane to improve safety for cyclists traveling eastbound on Colorado Avenue toward 28th Street/US 36. 
  • Add an additional vehicle lane to separate vehicles turning right on to Colorado Avenue from Regent Drive and vehicles turning right on to 28th Street/US 36 from Colorado Avenue from other traffic.
  • Add a realigned raised crosswalk and multiuse path in place of the existing southside sidewalk. 

Please review the final design pdf.

Baseline Road and 29th Street

Construction will begin on the Baseline Road and 29th Street Intersection Safety Improvement project the week of Jan. 18, 2021. As part of this project, 29th Street north of the Baseline Road intersection will be closed during construction and traffic will need to use detours to access 29th Street. Construction is anticipated to finish in February 2021, weather-dependent.


From January 2012 through October 2016, 23 crashes occurred at the intersection of Baseline Road and 29th Street. Twelve of these crashes resulted in injuries and 11 were property damage-only crashes.

Over half (52%) of the total crashes and nearly all (92%) of the crashes that resulted in injuries involved cyclists. Most of the bicycle crashes involved conflicts between southbound-turning vehicles and eastbound cyclists riding on the north side of the multiuse path. Nearly all of the vehicles involved in the crashes were turning right onto westbound Baseline Road. Other crashes included five left-turn collisions, two sideswipes, two rear-ends and two crashes involving vehicles moving in reverse.

Proposed improvements include:

  • Reorient the intersection of Baseline Road and 29th Street to create a right-angle intersection and better sight distances for southbound vehicles approaching Baseline Road from 29th Street.
  • Improve safety for pedestrians and cyclists by installing a raised crosswalk across 29th Street, which will slow vehicle speeds and improve the visibility of bicycles and pedestrians.
  • Add curb extensions to the east and west sides of 29th Street to shorten the crossing distance for bicycles and pedestrians and calm vehicular traffic. 

Please review the final design pdf.

Broadway and Rayleigh Road

Between November 2011 and November 2019, 16 crashes occurred at the intersection of Broadway and Rayleigh Road. Three crashes involved cyclists in the west crosswalk, and two of these crashes resulted in non-incapacitating injuries to the cyclists. Two of the crashes involved southbound right-turning vehicles that were rear-ended while yielding to cyclists in west crosswalk.

Proposed improvements include:

  • Add a right-turn only lane in the southbound direction on Broadway to separate vehicles entering the National Institute of Standards and Technology (NIST) property from other southbound traffic.
  • Add a right-turn bypass (slip) lane with a raised crosswalk to slow turning vehicles. 
  • Signalize right-turn movements in and out of the federal labs property, mitigating conflicts between vehicles, pedestrians, and cyclists.
  • Reorient the multiuse path to improve sight lines between vehicles and cyclists, and slow cyclists as they approach the crosswalk.

Please review the final design pdf.


News & Events

Construction will begin on the Baseline Road and 29th Street Intersection Safety Improvement project the week of Jan. 18, 2021. As part of this project, 29th Street north of the Baseline Road intersection will be closed during construction and traffic will need to use detours to access 29th Street. Construction is anticipated to finish in February, weather-dependent.

Click here for a map of the closure and detour routes pdf.

Work will begin on the Broadway and Rayleigh Road and Colorado Avenue and Regent Drive Intersection Safety Improvements projects once the Baseline Road and 29th Street project is finished. Please check this page for further updates.



Ryan Noles
Senior Transportation Planner
[email protected]