Ill. Admin. Code tit. 92, § 1710.50
Signs meeting the specifications of Section 18a-302 of the Law [625 ILCS 5/18a-302] and Section 1710.51 shall be posted on each lot from which a relocator is authorized to remove unauthorized vehicles. Such signs must be posted at least 24 hours before any vehicle is relocated from the lot.
(Source: Amended at 22 Ill. Reg. 16200, effective August 31, 1998)