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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:
  • Colorado Avenue and Regent Drive
  • Baseline Road and 29th Street
  • Broadway and Rayleigh Road

The purpose of these projects is to reduce crashes between bicycles, pedestrians, and motor vehicles, and to improve the overall safety and comfort of these locations for users of all transportation modes.

Provide Comments Online

City staff held a public meeting to review projects on March 6. 2019. If you were unable to attend the open house and would like to provide feedback on these projects, please fill out an online comment form. Comments will be accepted until Friday, May 3.

Please review the project background pdf, schedule pdf, and existing conditions pdf for all three locations for information on the projects. The recommended designs for each location can be found in the drop-down lists below. 


Project Information by Location

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 
  • 8 crashes included bicyclists
  • 2 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 bicyclists in the raised crossing. Most of the rear-end crashes (78 percent) 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 recommended design pdf.

Baseline Road and 29th Street

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 percent) of the total crashes and nearly all (92 percent) of the crashes that resulted in injuries involved bicyclists. Most of the bicycle crashes involved conflicts between southbound-turning vehicles and eastbound bicyclists 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 recommended design pdf.

Broadway and Rayleigh Road

Between November 2011 and November 2016, a total of 13 crashes occurred at the intersection of Broadway and Rayleigh Road. Three crashes involved bicyclists in the west crosswalk, and two of these crashes resulted in evident - non-incapacitating injuries to the bicyclists. Two of the crashes involved southbound right turning vehicles getting rear ended while yielding to bicyclists in the crosswalk on the west leg.

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 raised crosswalk in a right-turn bypass lane to slow vehicle speeds, improve the visibility of bicycles and pedestrians, and shorten the distance to cross Rayleigh Road for bicycles and pedestrians.
  • Reorient the multiuse path to align with the new raised crosswalk and crossing island.

Please review the recommended design pdf.



Ryan Noles
Transportation Planner
[email protected]