The following are exempted from the provisions of this chapter:

1. (a) Ambulances owned and operated by the Federal Government.
2. (b) A vehicle or vehicles rendering assistance to community ambulances in the case of a catastrophe when licensed ambulances in the locality are insufficient to render the required services.
3. (c) The use of a privately or publicly owned vehicle, not ordinarily utilized in the transportation of persons who are sick, injured or otherwise incapacitated and operating under the provisions of Section 15-1-310 (Good Samaritan Act) in the prevention of loss of life and alleviation of suffering.