R.I. Gen. Laws § 24-12-19
The proceeds of the bonds of each issue shall be used solely for the payment of the cost of the project or projects for which the bonds shall have been issued, and shall be disbursed in the manner and under the restrictions, if any, as the authority may provide in the resolution authorizing the issuance of the bonds or in the trust agreement hereinafter mentioned securing the bonds; provided, however, that the amount of the proceeds of the revenue bonds of the first series as may be determined by the authority prior to the issuance of the bonds may be applied to the payment of engineering, financing, and legal services in connection with the financing and the construction of the Newport Bridge or the turnpike or both. If the proceeds of the bonds of any issue, by error of estimates or otherwise, shall be less than the cost, additional bonds may in like manner be issued to provide the amount of the deficit, and, unless otherwise provided in the resolution authorizing the issuance of the bonds or in the trust agreement securing the bonds, shall be deemed to be of the same issue and shall be entitled to payment from the same fund without preference of priority of the bonds first issued. If the proceeds of the bonds of any issue shall exceed the cost, the surplus shall be deposited to the credit of the sinking fund for the bonds or, if so authorized by the authority, may be applied to the payment of the cost of any project thereafter financed under the provisions of this chapter.
R.I. Gen. Laws § 24-12-19