No person or public utility shall erect or place any barrier or sign on any street unless of a type approved by the City Manager, nor shall any person disobey the instructions, remove, tamper with or destroy any barrier or sign lawfully placed on any street by any person, public utility or by any department of this City. (Ord. 87-4 § 45, 1987; Ord. 76-3 § 1, 1976; Ord. 155 NS § 8.5, 1967; prior code § 13-40.)