PDFWAC 296-32-22530
Employee protection in public work areas.
(1) Before work begins in the vicinity of vehicular or pedestrian traffic that may endanger employees:
(a) Traffic control signs, devices, and barriers must be positioned and used according to the requirements of chapter 296-155 WAC, Part E.
(b) When flaggers are used, employers, responsible contractors and/or project owners must comply with the requirements of WAC 296-155-305.
(2) During hours of darkness, warning lights must be prominently displayed and excavated areas must be enclosed with protective barricades.
(3) When work exposes energized or moving parts that are normally protected, danger signs must be displayed and barricades erected to warn other personnel in the area.
(4) The employer must ensure that an employee finding any crossed or fallen wires which create or may create a hazardous situation at the work area:
(a) Remains on guard or adopts other adequate means to warn other employees of the danger; and
(b) Has notified the proper authority or controlling utility at the earliest practical moment.