(a) It is unlawful for any person under fifteen years of age to operate or be a passenger on a bicycle or any attachment to a bicycle used on a public roadway, public bicycle path or other public right-of-way unless at all times when the person is so engaged he or she wears a protective bicycle helmet of good fit, fastened securely upon the head with the straps of the helmet.
(b) It is unlawful for any parent or legal guardian of a person under fifteen years of age to knowingly permit such person to operate or be a passenger on a bicycle or on any attachment to a bicycle used on a public roadway, public bicycle path or other public right-of-way unless at all times when the person is so engaged he or she wears a protective bicycle helmet of good fit, fastened securely upon the head with the straps of the helmet.