(1) The interior of an ambulance, including all storage areas, must be kept clean and free from dirt, grease, and other contaminants. 

(2) Persons utilized as drivers of ambulances must have a valid driver's license and have completed the service's vehicle operations training.

(3) If an ambulance service publicly advertises a telephone number to receive calls for emergency assistance, that telephone number must be answered 24 hours a day, seven days per week.

(4) An ambulance service may transport patients who are receiving care at a higher level than the level for which the service is licensed if:

(a) the higher level of care is initiated by a licensed emergency medical service authorized to perform that level of care; and

(b) the personnel and the equipment of the emergency medical services licensed at the higher level accompany the patient in the ambulance.

(5) An ambulance service may perform inter-facility (including between a physician's office and hospital) transfers at a higher level of care than the level to which the service is licensed if personnel trained and legally authorized to provide the higher level of care, as well as appropriate equipment, accompany the patient in the ambulance to ensure continuity of patient care.