(1) In case a motor vehicle carrying passengers becomes disabled while en route and is unable to proceed, any passenger or passengers on such disabled vehicle shall have the privilege of proceeding upon any other passenger-carrying vehicle operating under a class A or class B certificate from the commission on the same route or portion of route.

(2) It shall be the duty of the driver of any such passenger-carrying vehicle to stop on signal and receive such passengers to the extent of the unoccupied seating capacity of

such vehicle and carry the same to destination or as near such destination as the route of the passing vehicle will permit.

(3) The transportation company whose passengers are thus relieved shall pay the second company a share of the transportation fee proportionate to the distance such passengers are transported by the relieving carrier.