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Updated: May 13, 2026
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Trajectory Data Analyses for Pedestrian Space-time Activity Study
Published on: February 25, 2013
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How does street environment affect pedestrian crash risks? A link-level analysis using street view image-based
Yijia Hu1, Long Chen2, Zhan Zhao3
1Department of Urban Planning and Design, The University of Hong Kong, Hong Kong Special Administrative Region.
Accident; Analysis and Prevention
|June 27, 2024
Summary
Street View Images (SVIs) reveal pedestrian exposure, showing more people increase crash frequency but reduce severe injuries. Pedestrian facility design significantly impacts crash risks and severity.
Area of Science:
- Urban Planning
- Transportation Engineering
- Public Health
Background:
- Street space is vital for pedestrian safety, yet fine-scale environmental influences remain unclear.
- Analyzing street-level pedestrian safety requires understanding spatial variations in pedestrian exposure, often hindered by data limitations.
Purpose of the Study:
- To extract link-level pedestrian exposure from Street View Images (SVIs).
- To investigate the impact of fine-scale street environments and pedestrian facilities on pedestrian crash risks (frequency and severity).
Main Methods:
- Utilized SVIs to derive link-level pedestrian exposure data.
- Analyzed pedestrian crash frequency and severity at the link level, considering maximum and medium severity metrics.
- Conducted a case study in Hong Kong.
Main Results:
- SVIs-derived pedestrian exposure improved model fit compared to zone-level data.
- Increased pedestrian exposure correlated with higher crash frequency but lower severe injury risk (safety in numbers effect).
- Crosswalk presence increased crashes, but denser designs mitigated this; two-sided sidewalks increased frequency, while no sidewalks raised severity risk.
Conclusions:
- Fine-scale street environment analysis using SVIs is crucial for understanding pedestrian safety.
- Pedestrian facility design (crosswalks, sidewalks) significantly influences crash outcomes.
- The findings emphasize optimizing street design and facilities to enhance pedestrian safety and reduce severe injuries.
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