For motor vehicles designed to carry not more than eight passengers, including the driver, the commission shall issue a suitable decal for purposes of Section 5385, for each vehicle registered with the commission and operated by a charter-party carrier of passengers holding a valid permit or certificate of public convenience and necessity. The decal with an identifying symbol shall be a minimum size of two and one-half inches by six inches, and shall be affixed to the lower right hand corner of the rear bumper of the vehicle.
