16 Pa. Stat. § 12701
The "Authority" is hereby authorized to make and enforce such rules and regulations, and to establish, levy and collect (or to authorize, by contract, franchise, lease or otherwise, the establishment, levying and collection of) such tolls, rents, rates, fees and other charges in connection with any properties which it may construct, erect, acquire, own, operate or control as it may deem necessary, proper, desirable and reasonable, which said tolls, rents, rates, fees and other charges shall be at least sufficient to meet the expenses thereof, including the cost of maintenance and operation thereof and interest and sinking fund or amortization charges; and the "Authority" is hereby authorized and empowered to pledge such tolls, rates, rents, fees and other revenues, or any part thereof, either presently received or to be received in the future, or both, as security for the repayment, with interest and taxes, if any, of any monies borrowed by it or advanced to it for any of its authorized purposes, and as security for the satisfaction of any other obligation assumed by it in connection with such loans or advances.
16 P.S. § 12701