1917.128—Signs and marking.
(a) General.
Signs required by this part shall be clearly worded and legible, and shall contain a key word or legend indicating the reason for the sign.
(2)
Legends are more specific explanations such as High Voltage, Close Clearance, Pedestrian Crossing.
(3)
Telephone numbers of the closest ambulance service, hospital or other source of medical attention, police, fire department, and emergency squad (if any); and