(a) Every person operating a moped upon a roadway shall ride, when practicable, within three feet of the right side of the roadway, obeying all traffic rules applicable to vehicles and exercising due care with passing a standing vehicle or one proceeding in the same direction.
(b) Persons riding mopeds upon a roadway shall ride not more than two abreast in a single lane, except on paths or parts of roadways set aside for the exclusive use of mopeds.