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Related Experiment Video

Updated: Jun 2, 2026

A Test Bed to Examine Helmet Fit and Retention and Biomechanical Measures of Head and Neck Injury in Simulated Impact

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Published on: September 21, 2017

What do cyclists need to see to avoid single-bicycle crashes?

Paul Schepers¹, Berry den Brinker

¹Ministry of Transport, Public Works, and Water Management, Centre for Transport and Navigation, The Netherlands. paul.schepers@rws.nl

|April 15, 2011

Summary

Single-bicycle crashes are linked to infrastructure's visual elements. Improving edge markings and bollard visibility can enhance cyclist safety and prevent accidents on bicycle paths.

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Area of Science:

Traffic safety research
Human-computer interaction
Transportation engineering

Background:

Single-bicycle crashes pose a significant risk in cycling-intensive regions.
Limited research exists on the visual factors influencing cyclist avoidance of single-bicycle crashes.

Purpose of the Study:

To investigate the relationship between visual infrastructure characteristics and single-bicycle crashes.
To identify specific visual elements contributing to cyclist accidents.
To introduce a novel method for quantifying visual accessibility in crash scenes.

Main Methods:

A two-step study combining a questionnaire with bicycle crash victims (n=734) and image analysis of crash scenes.
Logistic regression analyzed crash factors including age, light, alcohol, gaze, and familiarity.
The image degrading and edge detection (IDED) method quantified visual characteristics of 21 crash scenes.

Main Results:

Crashes involving collisions with bollards, road narrowing, or leaving the road were associated with visual aspects of bicycle facilities.
Specific findings highlight the impact of edge markings, particularly in curves.
The conspicuity of bollards emerged as a critical factor.

Conclusions:

Visual characteristics of bicycle infrastructure significantly influence single-bicycle crash occurrence.
Recommendations include enhancing edge markings on curves and improving bollard visibility.
The IDED-method is a valuable tool for assessing 'visual accessibility' in traffic safety analysis.