Agents may give orders or directions to users while using the V-1 signal established by the Vehicle Regulations, through the public address system or by any other means that can be clearly perceived, for example showing a red flag that indicates .. .
Drivers and users must be extremely vigilant in the proximity of a hazard .
The driver who precedes the vehicle of the agent or agents, must stop the vehicle on the right side in front of the police vehicle .
As a general rule from the vehicle that carries it, the road is temporarily closed to traffic to all vehicles and users .