Sec. 1505.105. SECURITY FOR PAYMENT OF OBLIGATIONS. (a) An obligation issued under this subchapter, and interest on the obligation, must be paid by an appropriation or pledge of all revenue derived from: (1) one or more projects; (2) any tolls authorized under Section 1505.113 and collected from the operation of an existing bridge or tunnel; or (3) both the project and the tolls. (b) Payment of the obligation may additionally be secured by a mortgage on any project, including a toll bridge or tunnel or reclaimed land. (c) Any revenue or income derived from one project may be pledged to the payment of an obligation issued to provide for a different project. Added by Acts 1999, 76th Leg., ch. 227, Sec. 1, eff. Sept. 1, 1999.