70 ILCS 520/9
In addition to the power and authority heretofore conferred upon the Authority, the Authority, in its own name, shall have full power and authority: to acquire and thereafter operate and maintain any existing vehicular toll bridge across any waters which form a common boundary between any city within the territory of the Authority and any other city either within or without the State and to reconstruct, improve and repair such existing bridge; to construct, maintain and operate an additional vehicular toll bridge and approaches across these waters at a point suitable to the interests of navigation and to reconstruct, repair and improve the same; to construct, maintain and operate a tunnel under these waters and to reconstruct, repair and improve the same; to reconstruct, improve, and repair or to provide financial aid for the reconstruction, improvement, and repair of any existing vehicular toll bridge; and to issue and sell bonds, notes, or other evidence of indebtedness for such purposes as provided in Section 7.
70 ILCS 520/9