Risk factors for unsafe events involving a motor vehicle for group riders (cyclists): A naturalistic case-crossover study

•A naturalistic study examined risk factors for unsafe events while group riding.•Roundabouts increased the risk of an unsafe event involving a motor vehicle.•Traffic islands, speed limits ≥ 60 km/h and rider violations also increased risk.•Riding 2 abreast in a traffic lane or with all riders in a...

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