Cyclists should wear helmets. Australian laws making helmets compulsory deterred people from cycling.
Robinson
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D000063:Accidents, Traffic / Q000517:prevention & control; D001642:Bicycling / Q000331:legislation & jurisprudence*; D006259:Craniocerebral Trauma / Q000517:prevention & control; D006260:Head Protective Devices; D006801:Humans; D009517:New South Wales