All excavation sites shall be provided with all necessary safety devices to protect persons and animals from falling into ditches or pits. Such devices shall include, but not exclusively, warning signs, lamps and barricades, and, where practicable, secure planking for pedestrians to cross upon, which shall be well lighted the entire way between the period from sunset to sunrise. The Director of Public Works may also, in the exercise of discretion, require that the permit holder employ flag people and station them at each end of the site of excavation to direct traffic.
(Prior Code, § 911.05)