Helmet use saves lives.
D000063:Accidents, Traffic; D006259:Craniocerebral Trauma / Q000209:etiology / Q000517:prevention & control*; D006260:Head Protective Devices / Q000706:statistics & numerical data*; D006292:Health Priorities; D006801:Humans; D037141:Mandatory Programs; D009049:Motorcycles / Q000331:legislation & jurisprudence*; D011640:Public Policy; D014944:World Health Organization