(1) All temporary discontinuances or interruptions of regular scheduled passenger service shall be reported promptly in writing to the commission with a full statement of the cause thereof and their probable duration and, as soon as known to the carrier, shall be reported forthwith to all ticket agents of the carrier along the route affected who shall notify the public by posting same forthwith on their bulletin boards together with their probable duration.

(2) Discontinuance of Class A or Class B service for a period of five consecutive days without notice to the commission shall be deemed a forfeiture of all right secured under and by virtue of any order or permission to operate; provided, however, that the commission may permit the resumption of operation after such five days' discontinuance on proper showing that the carrier was not responsible for the failure to give service.

(3) No Class A or Class B motor carrier shall discontinue the service called for under its certificate, and time schedule filed thereunder, without first having given to the commission and to the public, at least ten days' notice in writing of its intention to discontinue such service, and having secured from the commission permission to do so.