| http://www.w3.org/ns/prov#value | - A small proportion of these crashes are caused by animals and other hazards in the roadway and some causes are unknown, but the largest proportion of motorcyclist-only crashes is caused by rider error.*Crash data source: State Highway Administration Safety Information DatabaseCurrent Motorcycle LawsAs of October 2012:Required equipmentHelmets: All motorcycle operators and passengers are required t
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