A global tool for collision and near miss mapping

Trisalyn A. Nelson, Taylor Denouden, Benjamin Jestico, Karen Laberee, Meghan Winters

Research output: Contribution to journalArticlepeer-review

61 Scopus citations


There are many public health benefits to cycling, such as chronic disease reduction and improved air quality. Real and perceived concerns about safety are primary barriers to new ridership. Due to limited forums for official reporting of cycling incidents, lack of comprehensive data is limiting our ability to study cycling safety and conduct surveillance. Our goal is to introduce, a new website developed by the authors for crowdsource mapping of cycling collisions and near misses. is a global mapping system that allows citizens to map locations of cycling incidents and report on the nature of the event. Attributes collected are designed for spatial modeling research on predictors of safety and risk, and to aid surveillance and planning. Released in October 2014, within 2 months the website had more than 14,000 visitors and mapping in 14 countries. Collisions represent 38% of reports (134/356) and near misses 62% (222/356). In our pilot city, Victoria, Canada, citizens mapped data equivalent to about 1 year of official cycling collision reports within 2 months via Using report completeness as an indicator, early reports indicate that data are of high quality with 50% being fully attributed and another 10% having only one missing attribute.We are advancing this technology, with the development of a mobile App, improved data visualization, real-time altering of hazard reports, and automated open-source tools for data sharing. Researchers and citizens interested in utilizing the technology can get involved by encouraging citizen mapping in their region.

Original languageEnglish (US)
Article number53
JournalFrontiers in Public Health
Issue numberMAR
StatePublished - Mar 30 2015
Externally publishedYes


  • Active transportation
  • Bicycling safety
  • Citizen science
  • Cycling safety surveillance
  • Near miss

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health


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