35 ILCS 200/27-90
If at least 30% of the street or road mileage within the corporate limits of a municipality is comprised of streets and roadways not owned or controlled by the municipality or any other unit of government, and if the streets and roadways (including related drainage facilities and appurtenances) provide access for police, fire, and other emergency vehicles, the municipality may propose a special service area as provided in this Law for the purpose of repairing, reconstructing, or maintaining those streets and roadways; provided that if the owners of 51% or more in number of the lots, tracts, and parcels of real estate that are to be subject to the tax file a petition with the clerk of the municipality agreeing with the establishment of a special service area, then the corporate authorities of the municipality shall proceed with the establishment of a special service area. If a petition is not filed or contains an insufficient number of signatures, the corporate authorities of the municipality shall proceed no further and the same establishment of a special service area shall not again be initiated for a period of one year.
35 ILCS 200/27-90