Final answer:
A flagger must be clearly visible to the first approaching road user at all times to ensure the safety and proper guidance of traffic. Their visibility is critical to their role in traffic control.
Step-by-step explanation:
1) True. A flagger must be clearly visible to the first approaching road user at all times. This is essential for the safety of both the traffic control personnel and the oncoming traffic.
Flaggers play a critical role in guiding traffic safely through construction and maintenance zones on roadways where usual travel paths or traffic patterns are altered. For this reason, it's imperative that a flagger is stationed in a spot that both maximizes their visibility and minimizes the risk for all road users.