Del. Code tit. 2 § 1318
The State hereby pledges to and agrees with the holders of bonds issued pursuant to this chapter that the State will not limit or restrict the rights granted to the Authority by this chapter to construct, reconstruct, improve, extend, alter, modernize, repair, operate and maintain any transportation facilities, or to establish and collect such charges, fares, fees, rates, rentals and tolls as may be convenient or necessary to produce sufficient revenue to meet the expenses of maintenance and operation thereof and to fulfill the terms of any agreements made with the holders of bonds authorized by this chapter or in any way impair the rights or remedies of the holders of such bonds until the principal of, premium, if any, and interest on such bonds are fully paid and discharged.
2 Del. C. § 1318