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, inter alia, warning signs, lamps and barricades; and, where practicable, secure planking for pedestrians to cross upon, which shall be well lighted, the entire way, between sunset and sunrise.
(1991 Code, § 18-29) Penalty, see § 93.999