(a) Any person laying or repairing, or making any excavation in, any pavement on a street, alley, sidewalk or other public place shall maintain suitable barricades to prevent injury to any person or vehicle. The barricades shall be protected by lights at night.
(b) No person shall disturb or interfere with any barricade or lights lawfully placed in any street, alley, sidewalk or other public place.
(`91 Code, § 8-66)