The county legislative authority shall adopt a written policy outlining all road department personnel practices. The policy shall address recruitment, appointment, promotion, dismissal, hours of work, overtime, annual leave, sick leave, military leave, holidays, classification, union relationship where applicable, and general work rules, and may also include other topics as desired by the legislative authority. Copies of such policy shall be retained in the office of the county engineer and in all road department shops in such a manner that it will be readily available to all road department employees and prospective employees.