605 ILCS 5/4-101.14

To obtain, subject to the provisions of the "Personnel Code", approved July 18, 1955, as heretofore or hereafter amended, all employees necessary in the administration of its powers and duties under this Code.

However, persons assigned as highway maintenance employees who are not subject to jurisdiction B of the "Personnel Code" and who operate snow removal equipment shall not be discharged except for cause between October 31 of any year and May 1 of the following year.