For Bicyclists, Wearing a Yellow Reflective Jacket Cuts Injuries by up to 55%

Bicycles are involved in many crashes, injuries and deaths, and there should be a focus on preventing these events from happening.

With support from the Danish foundation TrygFonden, the Traffic Research Group at Aalborg University has completed the first randomised controlled trial (RCT) of the safety effect of high-visibility bicycle clothing.

Photo of a cyclist standing out from the crowd, in a bright yellow safety jacket.
Cyclist’s Yellow Safety Jacket. Photo used here by permission of Harry Lahrmann, Associate Professor at Aalborg University.  Photographer: Tor Asbjørn Thirslund

 The hypothesis was that the number of cyclist accidents can be reduced by increasing the visibility of the cyclists. The study design was an RCT with 6793 volunteer cyclists – 3402 test cyclists (with a yellow jacket) and 3391 control cyclists (without the jacket).

The safety effect of the jacket was analysed by comparing the number of self-reported accidents for the two groups. The accident rate (AR) (accidents per person month) for personal injury accidents (PIAs) for the test group was 47% lower than that of the control group.

For accidents involving cyclists and motor vehicles, it was 55% lower.

The study is reported in an open access article in Safety Science see –

This information was first posted (in our DSA/ADoNA-owned ‘Road Safety International’ group, at Linked-In) by Harry Lahrmann, Associate Professor at Aalborg University.

Author: EddieWren

Eddie Wren is the CEO and Chief Instructor at Advanced Drivers of North America. His driver safety background is given at:

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