Analysis of Active Warning Sign to Address Potential Bicycle 'Right-Hook' Conflict at Signalized Intersections

The goal of this paper is to compare conflict and crash data from before and after installation of an active warning sign intended to address potential bicycle ‘right-hook’ conflicts. This sign is currently only in operation at the signalized intersection of NE Couch Street at NE Grand Avenue in Portland, Oregon. The comparison between before and after data was used to determine whether the sign has a safety benefit in increasing awareness between road users and reducing right-hook conflicts. Data collected for this study was obtained from publicly available crash records and recorded video. A total of 48 hours of video was reviewed for the analysis, in which 18 conflicts were identified prior to the treatment and 6 conflicts were identified afterwards. The estimated crash rate based on crash records at the intersection of NE Couch Street at NE Grand Avenue was calculated to be 23.6 and 11.7 crashes per million entering bicycles for the ‘before’ and ‘after’ analysis periods, respectively. The conflict analysis found a statistically significant change that the installation of the active warning sign decreased the likelihood of right-hook conflicts for people biking through the intersection.

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• Supplemental Notes:
  • This paper was sponsored by TRB committee ANF20 Standing Committee on Bicycle Transportation. Alternate title: Analysis of Active Warning Sign to Address Potential Bicycle "Right-Hook" Conflict at Signalized Intersections
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Paulsen, Kirk
  • Farley, William
  • Mobley, Todd
  • Ard, Michael
  • Koonce, Peter
• Conference:
  • Transportation Research Board 95th Annual Meeting
  • Location: Washington DC, United States
  • Date: 2016-1-10 to 2016-1-14
• Date: 2016

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; Maps; Photos; References; Tables;
• Pagination: 13p
• Monograph Title: TRB 95th Annual Meeting Compendium of Papers

Subject/Index Terms

• TRT Terms: Bicycle crashes; Bicycling; Crash data; Right turns; Warning signs
• Geographic Terms: Portland (Oregon)
• Subject Areas: Operations and Traffic Management; Pedestrians and Bicyclists; Safety and Human Factors; I73: Traffic Control; I83: Accidents and the Human Factor;

Filing Info

• Accession Number: 01588689
• Record Type: Publication
• Report/Paper Numbers: 16-4330
• Files: PRP, TRIS, TRB, ATRI
• Created Date: Jan 29 2016 9:25AM