Identifying high-risk built environments for severe bicycling injuries

Area of Science:

• Urban planning and transportation safety.
• Environmental health and injury prevention.

Background:

• Knowledge gaps exist regarding the relationship between the built environment and bicyclist injury severity.
• Understanding these associations is crucial for developing effective safety interventions.

Purpose of the Study:

• To investigate correlations between built environment features and bicyclist injury severity.
• To identify key built environment factors associated with severe bicyclist injuries.
• To determine if these associations differ across cities with varying bicycling levels and built environments.

Main Methods:

• Utilized a generalized ordered logit model to analyze data.
• Coded bicyclist injury severity into four categories: no injury (NI), possible injury (PI), evident injury (EI), and severe injury and fatality (SIF).

Main Results:

• Mixed land use, residential land, green space, and office districts were associated with lower probabilities of evident injury and severe injury/fatality (SIF).
• Steep slopes correlated with increased bicyclist injury severity, while transit routes were linked to less severe outcomes.
• Higher speed limits increased the likelihood of SIF, whereas helmet use showed a negative association with SIF but a positive one with PI and EI.

Conclusions:

• Urban planners should promote mixed land use, dense street networks, and bike lanes in specific districts while avoiding steep terrain.
• Implementing local risk assessments is recommended before encouraging widespread bicycle use to mitigate severe injury risks.