S-2.1, r. 4 - Safety Code for the construction industry
2.8.4. Site signal persons: Where site signal persons perform their duties, they must meet the following conditions:
(1) wear fluorescent yellow-green high-visibility safety apparel of Class 2 or 3 and of Level 2 that complies with CSA Standard Z96, High-Visibility Safety Apparel;
(2) use one of the means of communication provided for in the traffic plan and that was taught to them during training;
(3) remain visible to operators of self-propelled vehicles directed by them and stay clear of the trajectory of those vehicles.