625 ILCS 5/1-154

(625 ILCS 5/1-154) (from Ch. 95 1/2, par. 1-154) Sec. 1-154. Official traffic-control devices. All signs, signals, markings, and devices which conform with the State Manual and not inconsistent with this Act placed or erected by authority of a public body or official having jurisdiction, for the purpose of regulating, warning, or guiding traffic. (Source: P.A. 76-1586.)