The Department shall have the following powers and duties:
(1) To promulgate, in cooperation with the Police Department, such rules and regulations as it deems necessary to carry out the provisions of this Chapter;
(2) To provide for the adequate posting of signs in each parking lot to which this Chapter applies clearly setting forth activities prohibited by this Chapter, including signs at each entrance to each parking lot to which this Chapter applies, which signs shall be of sufficient size such that the information printed thereon is clearly visible from a distance of at least 25 feet.