Twenty states and the District of Columbia have motorcycle helmet laws that require all riders to wear a helmet. Twenty-seven states have a motorcycle helmet law that only require some riders to wear a helmet. Three states (Illinois, Iowa, and New Hampshire) do not have a motorcycle helmet law.
Low-power cycle (LPC) is a generic term used by IIHS to cover motor-driven cycles, mopeds, scooters, and various other 2-wheeled cycles excluded from the motorcycle definition. While state laws vary, a cycle with an engine displacement of 50 cubic centimeters or less, brake horsepower of 2 or less, and top speeds of 30 mph or less typically is considered an LPC. Twenty-two states have motorcycle helmet laws that cover all low-power cycles. Twenty-five states and the District of Columbia have laws that cover some low-power cycles.
Twenty-one states and the District of Columbia have bicycle helmet laws that require some young bicyclists to wear a helmet. Local law may require helmet use for some or all bicyclists.
This article is coming from url:http://hldi.org/laws/HelmetUseCurrent.aspx