No person shall place any structure, tree, shrub, mailbox, or other obstruction upon any street, alley, sidewalk, parkway or any public place or authorize, procure or permit any structure, tree, shrub, mailbox, or other obstructions to be placed thereon, except as may be required by duly authorized city officials or employees of public utilities, and unless such person is authorized to place such obstruction pursuant to such rules and regulations as are prescribed by the city council; provided, that any excavation or obstruction in any street or alley, between sundown and sunup of each day, shall be properly guarded with suitable warning lights to safeguard against injury or accident.
(Prior code § 22-1)