Some countries,like Australia,France,and Germany,have laws about wearing helmets when driving a motorcycle.However,there is no federal law in the United States about this.Twenty states have helmet laws for all riders,and twenty-seven states have laws covering some riders,usually those younger than eighteen.However,states like Colorado,Illinois,and Iowa have no helmet laws.Likewise.there is no federal law about bicycle helmets in the United States;however,states have strated to make their own laws.For example,in California,riders under the age of eighteen must wear helmets.Whereas in Hawaii,Maine,and Georgia,the age is sixteen,and in Massachusetts,it is thirteen.