The operator of a motorcycle shall ride only astride the permanent and regular seat or saddle attached thereto, and the operator shall not permit more than one (1) other person to ride thereon nor shall such other person ride on the motorcycle unless it is designed to carry two (2) people, in which event the passenger shall also ride astride the permanent and regular seat or saddle if it is designed for two (2) persons, or astride another seat or saddle firmly attached to the rear of the operator; however, any seat or saddle designed for a passenger must be equipped with permanent handgrips and, in addition, the motorcycle must be equipped with footrests adjusted to fit such passenger. A sidecar may be attached to a motorcycle in which additional persons may ride.
(M.C. 1963, § 20.326.)