65 ILCS 5/1-2-9.2
In cities with a population over 500,000, the notice of violation of an ordinance governing the parking or standing of vehicles is the summons and complaint for purposes of the Code of Civil Procedure, as now or hereafter amended.
A police officer, parking enforcement aide, or other person authorized by ordinance to issue a notice of a vehicle parking or standing violation complaint may serve the summons and complaint for a vehicle parking or standing violation by affixing the original or a facsimile thereof to an unlawfully parked or standing vehicle or by handing the notice to the operator of the vehicle if the operator is present.
This Section is not intended to change the law in effect before the effective date of this amendatory Act of 1989, but is intended to clarify existing law. The service of a summons and complaint in accordance with this Section is legally sufficient regardless of whether service was made before, on, or after the effective date of this amendatory Act of 1989.
65 ILCS 5/1-2-9.2