t or legal guardian of the teenager. A notice shall be posted by all pay phones containing the local police telephone number and shall request all patrons to call the police if management neglects to take action to report a violation of this subsection. (s) Operation After 1:00 a.m. – 18 Year Olds . If the premises intends to operate after the closing time set forth in Subsection (i) herein, the premises must first be vacated by all customers, and thereafter only those persons 18 years of age or older who present valid identification containing proof of age established as set forth in Subsection (n) herein may be permitted to enter the premises. (t) Additional Restrictions by the Board . The Board may promulgate additional rules as necessary with respect thereto. (u) Regulation by Permittee . Nothing herein is intended to preclude the imposition of more restrictive regulations by any permittee so long as the regulations are not in conflict with any provision of this section.