N.C. Gen. Stat. § 136-28.9
Notwithstanding the provisions of G.S. 147-69.1, 147-77, 147-80, 147-86.10, and 147-86.11, or any other provision of the law, the Department of Transportation is authorized to enter into trust agreements with banks and contractors for the deposit of retainage and for the payment to contractors of income on these deposits, in connection with transportation construction contracts, in trust accounts with banks in accordance with Department of Transportation regulations, including deposit insurance and collateral requirements. The Department of Transportation may contract with those banks without trust departments in addition to those with trust departments. Funds deposited in any trust account shall be invested only in bonds, securities, certificates of deposits, or other forms of investment authorized by G.S. 147-69.1 for the investment of State funds. The trust agreement may also provide for interest to be paid on uninvested cash balances.
N.C. Gen. Stat. § 136-28.9