current motorcycle laws:
49-665. RIDING ON MOTORCYCLES.
A person operating a motorcycle shall ride only upon the permanent
and regular seat attached to it, and the operator shall not
carry any other person nor shall any other person ride on a
motorcycle unless the motorcycle is designed to carry more than
one (1) person, in which event a passenger may ride upon the
permanent and regular seat if designed for two (2) persons,
or upon another seat firmly attached to the rear or side of
MOTORCYCLE SAFETY HELMETS -- REQUIREMENTS AND STANDARDS.
No person under eighteen (18) years of age shall ride upon a
motorcycle as operator or passenger, upon any highway, unless
at all times when so operating or riding upon the vehicle he
is wearing, as part of his motorcycle equipment, a protective
safety helmet of a type and quality equal to or better than
the standards established for helmets by the director.