E.__Payments to reserve or sinking funds established by the authority to meet anticipated future costs of constructing or reconstructing designated interchanges or portions of interchanges submitted by the department or to accomplish other designated purposes for which the authority may issue bonds, provided that the funding for those projects financed from reserves, together with the estimated future costs of those projects, has been approved by the authority;

F.__Repayment to the Federal Government for grants or loans that were used in connection with the construction or reconstruction of any portion of the East-West Highway or of any interconnecting access roads, but only to the extent that the repayment is required in order for the authority to maintain or establish tolls on the East-West Highway; and

G.__Payment or repayment to the Federal Government or any agency of the Federal Government of any charges, taxes or other payments required by law in connection with the construction, reconstruction or operation of the East-West Highway or the financing or refinancing of the East-West Highway or any part of the East-West Highway.

2.__Sinking fund for payment of bonds. The tolls and all other revenues derived from the East-West Highway, except such a part of the tolls and revenues as may be required to pay the cost of maintaining, repairing and operating the East-West Highway and to provide reserves for that cost as may be provided for in a resolution authorizing the issuance of the bonds or in the related trust indenture or loan or other security agreement, must be set aside at such regular intervals as may be provided in the resolution or trust indenture or loan or other security agreement in a sinking fund that is pledged to, and charged with, the payment of:

A.__The interest upon those bonds as that interest falls due;

B.__The principal of the bonds as that principal falls due;

C.__The necessary fiscal agency charges for paying principal and interest; and

D.__Any premiums upon bonds retired by call or purchase as provided in this subsection.