Contractors for building or other purposes, and all other persons who place materials or other obstructions of any kind on, or who make excavations upon, any street, alley, or sidewalk shall place and keep burning, about or around the excavation or work area, at least two (2) yellow signal lights in the most conspicuous place.
('71 Code, § 92.13) (Ord. 107, passed 11-7- ) Penalty, see § 97.99