Correct answer
Not wearing a helmet.
Not wearing a helmet. An approved, correctly sized and properly fastened helmet can reduce head-injury severity, though it cannot guarantee preventing all injury. Lack of a helmet increases potential crash consequences; this does not require claiming it is the most frequent crash cause or assigning the same collision pattern to all motorcycles. The question concerns injury protection rather than statistically ranking crash causes.
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Not wearing a helmet.
Wearing an approved, correctly sized and properly fastened helmet.
Replacing a damaged helmet with an approved, suitable one.
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