County highway commissions, often called road boards, are not required by general law. They are created by private act. Some road boards are popularly elected and some are appointed by the county legislative body. Private acts may grant road boards a role in budgeting and purchasing for the road department. Private acts cannot, however, authorize road boards to encroach upon the personnel policy powers or day-to-day administrative authority of the CAO over the personnel of the highway department or encroach upon other powers given to the CAO by the CUHL, such as authority over the county road system.