What is the proper use of a hand signal by a flagger?

• A. Wave arms randomly to attract attention.
• B. Use standard signals as trained to stop, slow, or proceed.
• C. Only use verbal commands.
• D. Signals are optional during good visibility.

Answer: (B)

The main idea is that a flagger communicates train movements through standardized hand signals trained to stop, slow, or proceed. These signals are clear, deliberate, and universally understood by engineers, so the instruction is unambiguous and immediate. Using recognized signals ensures a safe, coordinated flow of traffic in work zones, even when there’s noise or distance between the flagger and the locomotive crew. Waving arms randomly can be misread or missed, and relying on verbal commands alone can fail in loud environments. Signals are not optional; they must be used whenever a flagger is directing train movement, even in good visibility, to maintain safety and clarity.