605 ILCS 5/4-201.14

(a) To construct, maintain and operate rest areas on State highways.

In the operation of rest areas, the Department is authorized to prescribe reasonable rules and regulations not inconsistent with law, limiting the duration of rest stops and promulgating instructions and restrictions for the use and enjoyment of the rest area.

(b) To construct rest areas on highways not on the State highway system when such highways are constructed under Section 3-104.3 of this Code.