The board of a school district or the governing body of a nonpublic school may authorize a school principal or administrator to establish a safety patrol and to appoint students to the safety patrol. Any student enrolled in grade five or higher is eligible for appointment to a safety patrol, provided the student’s parent has filed written permission with the school principal or administrator. The superintendent of public instruction shall adopt rules to guide safety patrol members in the conduct of their duties and shall specify the identification to be worn and the signals to be used by safety patrol members while on duty.