Area of an individual face shall not exceed 500 square feet. The area of a face can be increased to up to 672 square feet if the billboard operator agrees to make the billboard available for public service announcements and emergency alerts. Public service announcements shall include, but not be limited to, advertising for civic events. Emergency alerts shall include those messages necessitating the immediate release of information pertaining to the protection and preservation of public safety. Emergency alerts include, but are not limited, Amber Alerts and emergency evacuation orders. The Director of Community Development, working with the Director of Public Works, Director of Parks and Recreation, Police Chief, and Fire Chief, shall develop administrative rules that shall be used for public service and emergency alerts. The rules shall specify required message duration and length of display for both public service announcements and emergency alerts.