(a) The Authority is hereby authorized, by resolution, to provide for the issuance, from time to time, of refunding or advance refunding bonds for the purpose of refunding any bonds then outstanding at maturity or on any redemption date, whether an entire issue or series, or one or more issues or series, or any portions or parts of any issue or series, which shall have been issued by the Authority or its predecessor, the Illinois State Toll Highway Commission.(b) The proceeds of any such refunding bonds may be used for any one or more of the following purposes: (1) To pay the principal amount of any outstanding bonds to be retired at maturity or redeemed prior to maturity;(2) To pay the total amount of any redemption premium incident to redemption of such outstanding bonds to be refunded;(3) To pay the total amount of any interest accrued or to accrue to the date or dates of redemption or maturity of such outstanding bonds to be refunded;(4) To pay any and all costs or expenses incident to such refunding;(5) To make deposits into an irrevocable trust in accordance with subsection (f) of this Section 20.1. Refunding bonds may be issued in amounts sufficient to accomplish any one or more of the foregoing purposes, taking into consideration the income earned on bond proceeds prior to the application thereof or without taking such income into consideration.(c) The issuance of refunding bonds, the maturities and other details thereof, the rights of the holders thereof and the rights, duties and obligations of the Authority in respect of the same shall be governed by the provisions of this Act, insofar as the same may be applicable, and may in harmony therewith be adjusted and modified to conform to the facts and circumstances prevailing in each instance of issuance of such refunding bonds. The Authority need not comply with the requirements of any other law applicable to the issuance of bonds other than as set forth in this Act.(d) With reference to the investment of the proceeds of any such refunding bonds, the Authority shall not authorize or anticipate investment earnings exceeding such as are authorized or permitted under prevailing federal laws, regulations and administrative rulings and interpretations relating to arbitrage bonds.(e) The proceeds of any such refunding bonds (together with any other funds available for application to refunding purposes, if so provided or permitted by resolution authorizing the issuance of such refunding bonds, or in a trust indenture securing the same) may be placed in trust to be applied to the purchase, retirement at maturity or redemption of the bonds to be refunded on such dates as may be determined by the Authority. Pending application thereof, the proceeds of such refunding bonds and such other available funds, if any, may be invested in direct obligations of, or obligations the principal of which and any interest on which are unconditionally guaranteed by, the United States of America which shall mature, or which shall be subject to redemption by the holder thereof at its option, not later than the respective date or dates when such proceeds and other available funds, if any, will be required for the refunding purpose intended or authorized.(f) Upon (1) the deposit of the proceeds of the refunding bonds (together with any other funds available for application to refunding purposes, if so provided or permitted by resolution authorizing the issuance of such refunding bonds, or in a trust indenture securing the same) in an irrevocable trust pursuant to a trust agreement with a trustee requiring the trustee to satisfy the obligations of the Authority to timely pay at maturity or upon prior redemption the outstanding bonds for which the proceeds of the refunding bonds and other funds, if any, are deposited, in an amount sufficient to satisfy the obligations of the Authority to timely pay at maturity or upon prior redemption such outstanding bonds, or (2) the deposit in such irrevocable trust of direct obligations of, or obligations the principal and interest of which are unconditionally guaranteed by, the United States of America in an amount sufficient, without regard to investment earnings thereon, to satisfy the obligations of the Authority to timely pay at maturity or upon prior redemption such outstanding bonds, or (3) the deposit in such irrevocable trust of obligations referred to in (2) above in an amount sufficient so that, taking into account investment earnings, upon maturity (or upon optional redemption by the trustee) of such obligations amounts will be produced on a timely basis sufficient to satisfy the obligations of the Authority to timely pay at maturity or upon prior redemption such outstanding bonds, such outstanding bonds shall be deemed paid and no longer be deemed to be outstanding for purposes of such resolution or trust indenture and all rights and obligations under any such prior resolution or trust indenture shall be deemed discharged notwithstanding any provision of any such outstanding bonds or any resolution or trust indenture authorizing the issuance of such outstanding bonds; provided, however, that the holders of such outstanding bonds shall have an irrevocable and unconditional right to payment in full of all principal of and premium, if any, and interest on such outstanding bonds, at maturity or upon prior redemption, from the amounts on deposit in such trust. The trustee shall be any trust company or bank in the State of Illinois having the power of a trust company possessing capital and surplus of not less than $100,000,000.(g) It is hereby found and determined that the contractual rights of the bondholders under any such prior resolution or trust indenture will not be impaired by a refunding pursuant to the provisions of this Section 20.1 in that, the payment of such outstanding bonds having been provided for as set forth herein, the bondholders' rights and security as to payment of the principal of, premium, if any, and interest on such outstanding bonds will have been enhanced, and the bondholders shall suffer no financial loss. It is hereby further found and determined that a refunding of any outstanding bonds of the Authority pursuant to this Section 20.1 shall further the purposes set forth in Section 1.P.A. 83-1258; 92-0016, eff. 6/28/2001.