(1) Privately owned vehicles not ordinarily used in the business of transporting persons who are sick, injured, wounded or otherwise incapacitated or helpless;

(2) A vehicle rendering service as an ambulance in case of a major catastrophe or emergency when the ambulances with permits and based in the locality of the catastrophe or emergency are insufficient to render the services required;

(3) Ambulances based outside the State rendering service in case of a major catastrophe or emergency when the ambulances with permits and based in the locality of the catastrophe or emergency are insufficient to render the services required;

(4) Ambulances owned and operated by an agency of the United States government;

(5) Ambulances based outside the State engaged in interstate transportation.