(b) This section does not prohibit a banking institution and a banking customer from agreeing in writing to a greater period of time than that otherwise prescribed by regulation pursuant to this section for the drawing against items because of special circumstances, provided that, such agreement is not contained in a pre-printed form and is not a usual, regular business practice of the institution. 5. Such regulations shall require every banking institution to notify each of its banking customers, in writing, of the applicable time limitations on the right to draw on items received for deposit in the customer's account and to keep posted in a conspicuous place at each branch, a notice substantially setting forth the generally applicable time limitations of the banking institution's customers' rights to draw on items deposited to their accounts. 6. The superintendent of financial services is empowered, upon a determination that the uniform application of a regulation adopted pursuant to this section would result in unsafe or unsound banking practices, to issue such further regulation or order with respect thereto as it deems appropriate. 7. In this section "banking institution" has the same meaning ascribed to it by section nine-f of this chapter and "item" has the same meaning ascribed to it by the uniform commercial code.