The authority may not levy taxes nor may it pledge the credit or taxing power of the state or any political subdivision except for the pledging of receipts of taxes, special assessments or charges collected by the state or a political subdivision and returnable or payable by law or by contract to the authority and except for the pledge by a political subdivision of the state of its full faith and credit in support of its contractual obligations to the authority as authorized by law. Transportation facilities shall be financed, in addition to other methods of financing provided by law, as follows:
(a) By fares, rates, tolls and rents.(b) By other income or revenues from whatever source available, including appropriations or contributions of whatever nature or other revenues of the participating counties and political subdivisions within the geographical boundaries of the authority.(c) By grants, loans or contributions from federal, state or other governmental units and grants, contributions, gifts, devises or bequests from public or private sources.(d) By proceeds of taxes, special assessments or charges imposed pursuant to law and collected by the state or a political subdivision and returned or paid to the authority pursuant to law or contract.1967, Act 204, Imd. Eff. 7/10/1967 ;--Am. 1970, Act 250, Imd. Eff. 12/31/1970.