Except as hereinafter provided and in addition to all other duties imposed upon it by law, the county commission shall cause emergency ambulance service to be made available to all the residents of the county where such service is not otherwise available: Provided, however, That the duty imposed upon county commissions by this article shall not be construed in such manner as to impose a duty to cause such emergency ambulance service to be provided unless the commission shall make an affirmative determination that there are funds available therefor by the inclusion of a projected expenditure for such purpose in the current levy estimate, and in the event that such county commission shall make such determination the commission shall not be under a duty to cause such service to be provided beyond a level commensurate with the amount of funds actually available for such purpose.

The county commission may provide the service directly through its agents, servants and employees; or through private enterprise; or by its designees; or by contracting with individuals, groups, associations, corporations or otherwise; or it may cause such services to be provided by an authority, as provided for in this article; and any municipality or county, or both, or any two or more municipalities within any county or contiguous counties, or any two or more contiguous counties, or any combination thereof, may create an authority. Such authority shall be created upon the adoption, by the governing body of each participating government, acting individually, of an appropriate ordinance or order. Each authority shall constitute a public corporation, and as such, shall have perpetual existence. The authority shall be known by such name as may be established by the board.