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"from NHTSA:Per mile traveled in 2018, the number of deaths on motorcycles in the U.S. was nearly 27 times the number in cars;Studies estimate that wearing a helmet reduces the risk of dying in a crash by 37 to 42%; andUnhelmeted riders are 3 times more likely than helmeted ones to sustain traumatic brain injuries in the event of a crash."https://www.forbes.com/sites/tanyamohn/2021/05/31/thinking-of-not-wearing-a-motorcycle-helmet-think-again/?sh=60cd0461301b