605 ILCS 5/6-303
Existing township and district roads may be widened, altered or vacated, and new township and district roads may be laid out in the manner provided in this Division of this Code. Any number of voters not less than 5% of the legal voters, or 12 legal voters, whichever is less, residing in any road district may file a petition with the highway commissioner of such district, praying for the laying out, widening, altering or vacation of such roads. Notwithstanding the preceding sentence, in counties with a population between 125,000 and 130,000, a petition for laying out, widening, altering, or vacating roads in a subdivision established under a county subdivision ordinance, where the final plat of the subdivision was approved by the county board, shall be filed with the county board unless the plat was filed with the county recorder at least 15 years before the petition is filed.
However, where the laying out, widening, altering or vacating of a township or district road is required by the construction, operation, or maintenance of a State highway, the Department, in lieu of a petition may file a certificate, signed by the Secretary of the Department, or his duly authorized agent, setting forth the necessity for the laying out, widening, altering or vacating of such roads. The procedure upon the filing of such certificate shall be the same as, and conform to, the procedure followed upon the filing of a petition. Such petition or certificate shall set forth a description of the road and what part is to be widened, altered or vacated, and if for a new road the names of the owners of lands, if known, and if not known it shall so state, over which the road is to pass, the points at or near which it is to terminate. When the general course of relocated roads shall render the same practicable, such relocated roads shall be laid out on section lines, or regular divisional lines subdividing a section or sections.
The highway commissioner, in lieu of a petition, may file a certificate with district clerk and county clerk to vacate roads. The procedure upon filing of such certificate shall be the same as, and conform to, the procedure followed upon the filing of a petition.
605 ILCS 5/6-303