All bonds issued under authority of this Division shall bear interest at not more than the maximum rate authorized by the Bond Authorization Act, as amended at the time of the making of the contract, and may be sold by the county board in such manner as they deem best in the public interest; provided, however, such bonds shall be sold at such price that the interest cost of the proceeds therefrom will not exceed the maximum rate authorized by the Bond Authorization Act, as amended at the time of the making of the contract, based on the average maturity of such bonds, and computed according to standard tables of bond values. Such bonds shall be payable solely and only from the revenues to be derived from the operation of any or all of its parking facilities and shall be secured by a pledge of the revenues of any or all of its parking facilities.
     Such bonds when issued shall have all the qualities of negotiable instruments under the Law Merchant and the Uniform Commercial Code. Such bonds may bear such date or dates and may mature at such time or times, not exceeding 30 years from their date or dates, and may be in such form, carry such registration privilege, may be payable at such place or places, may be subject to such terms of redemption, prior to maturity, with or without premium, as so stated on the face of the bond, and contain such terms and covenants, all as may be provided by ordinance authorizing the issuance of such bonds. To secure the payment of any or all of such bonds and for the purpose of setting forth the covenants and undertakings of the county in connection with the issuance of any additional bonds, as well as the use and application of the revenue and income to be derived from the said facilities, the county board may execute and deliver a trust agreement and agreements. Such bonds shall be executed by such officers as the county board shall designate in the said ordinance. Any bonds bearing the signatures of officers in office at the date of signing thereof shall be valid and binding for all purposes, notwithstanding that before delivery thereof any or all such persons whose signatures appear thereon shall cease to be such officers.
     Each such bond shall state upon its face that it is payable solely and only from the proceeds derived from the operation of the parking facility or facilities and shall state upon its face that it does not constitute an obligation of the county within the meaning of any constitutional or statutory limitation or provision.
     With respect to instruments for the payment of money issued under this Section or its predecessor either before, on, or after the effective date of Public Act 86-4, it is and always has been the intention of the General Assembly (i) that the Omnibus Bond Acts are and always have been supplementary grants of power to issue instruments in accordance with the Omnibus Bond Acts, regardless of any provision of this Division or “An Act in relation to the construction, operation and maintenance of parking facilities for motor vehicles by counties”, approved July 13, 1955, that may appear to be or to have been more restrictive than those Acts, (ii) that the provisions of this Section or its predecessor are not a limitation on the supplementary authority granted by the Omnibus Bond Acts, and (iii) that instruments issued under this Section or its predecessor within the supplementary authority granted by the Omnibus Bond Acts are not invalid because of any provision of this Division or “An Act in relation to the construction, operation and maintenance of parking facilities for motor vehicles by counties”, approved July 13, 1955, that may appear to be or to have been more restrictive than those Acts.