(1) All ground ambulances must have the following markings and emblems:

(a) The word "ambulance" must be affixed in mirror image in reflectorized lettering, centered above the grill on the front of the vehicle; and

(b) The word "ambulance" must be affixed to the rear of the vehicle in reflectorized lettering.

(2) The required markings may not appear on nonlicensed ambulances, with the exception of those ambulances temporarily in transit within the state.

(3) An ambulance must be equipped with operational emergency lighting and siren.

(4) All new ambulances, except those in service in Montana on or before January 1, 1990, must be equipped with audible backup warning devices.