Traffic Vest Is A Private Construction Worker Vested With Any Legal Authority To Stop And Control Traffic?

Is a private construction worker vested with any legal authority to stop and control traffic? - traffic vest

A construction worker in jeans and T-shirt on the stairs in the street, in a private site design (no roads) and stop traffic to allow trucks to maneuver on the road. It's the construction workers with the legal authority for traffic control invested? The traffic is legally bound to obey? BTW, the type of construction is not a flag. Suppose that the Mess is time in the truck traffic and maneuvering, impatient, ignores the builders and go carefully through the. They have broken no law?

My son does the same thing to my boat that can maneuver on the street. It is also given the power to control the movement? It is legally bound to obey, traffic or is it just a courtesy?