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Bicyclist safety performance functions for a U.S. city.

Krista Nordback1, Wesley E Marshall2, Bruce N Janson3

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This study introduces the first city-specific bicycle safety performance functions (SPFs) for U.S. cities. Findings show cyclists are safer in numbers, with fewer collisions per cyclist at busier intersections.

Keywords:
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Area of Science:

  • Transportation Engineering
  • Road Safety Analysis
  • Urban Planning

Background:

  • Traffic safety increasingly relies on evidence-based approaches, exemplified by the Highway Safety Manual (HSM).
  • The HSM provides safety performance functions (SPFs) for various road types but lacks specific models for bicyclists.
  • Bicyclists face disproportionately high fatality rates, highlighting a critical gap in current safety analysis tools.

Purpose of the Study:

  • To develop a methodology for creating city-specific bicycle safety performance functions (SPFs).
  • To apply this methodology to Boulder, Colorado, establishing the first bicycle SPFs for a U.S. city.
  • To provide a foundation for evaluating safety treatments and prioritizing infrastructure investments for cyclist safety.

Main Methods:

  • Development of a novel method to generate bicycle-specific SPFs tailored to urban environments.
  • Application of the developed method using data from Boulder, Colorado.
  • Analysis of the relationship between traffic volumes (motorist and cyclist) and crash frequencies at intersections.

Main Results:

  • The study successfully created city-specific bicycle SPFs for Boulder, Colorado.
  • Results confirm that higher volumes of both bicyclist and motorist traffic correlate with increased motorist-cyclist collisions.
  • A key finding indicates that cyclist safety increases with numbers, as intersections with more cyclists experience fewer collisions per cyclist.

Conclusions:

  • The developed methodology enables the creation of crucial bicycle SPFs for U.S. cities.
  • These bicycle SPFs are essential for data-driven safety improvements and resource allocation.
  • Promoting cycling in larger groups or at busier, potentially safer, intersections could enhance overall bicyclist safety.