Most states have some laws that require a rider and their passenger to wear helmets. Some states, such as Alaska, Arizona, Colorado, Hawaii, Indiana, New Mexico, Utah, and Maine, require riders and passengers ages 18 and under to wear a helmet.
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In a study of more than 64,000 cyclists, helmets reduced the risk of major head injury by almost 70%. Additionally, of bike riders involved in a crash, helmet use has been estimated to reduce the risk of head injury by 85%.