unique city of chicago vintage industrial "workers ahead" cautionary sign suspended from a welded joint angled steel collapsible signicade. the brightly colored orange enameled double-sided sign is comprised of heavy gauge steel. weathered and worn surface left untouched. contains two cylindrical brackets used for mounting small wood poles containing red flags. measures 27 1/2 x 18 1/2 inches. fabricated by or for the city of chicago streets & sanitation department.