70 ILCS 1310/6
Whenever any Board of Park Commissioners seek to defray the cost of the construction of an elevated pleasure highway or boulevard wholly or in part out of the proceeds of a bond issue as hereinafter provided, such Board of Park Commissioners shall by ordinance duly passed before submission of the question of the issuance of such bonds to referendum, set forth the route to be used; the aggregate estimated cost of construction; the character of construction; the method of defraying the entire cost, whether by agreement with other governmental agencies or wholly out of the proceeds of bond issue; that the proposition is to be voted upon at a specified ensuing regular election, and setting forth the amount of bonds which it is proposed to issue and the form of the proposition, and such other material detail as will advise the legal voters of the district of the general character and plan of such proposed elevated highway or boulevard.
70 ILCS 1310/6