Warning signs or flashing lights. If you see emergency or incident support vehicles displaying flashing lights in the distance, be aware there may be an incident ahead (see Rule 219). You should slow down and be prepared to move safely into another lane or stop.
The emergency services, traffic officers and recovery workers may be required to work in the carriageway; for example, dealing with debris, collisions or conducting rolling roadblocks. You MUST follow any directions given by police or traffic officers as to whether you can safely pass the incident or obstruction.