What is a fundamental skill that all flaggers need to possess?

Answer: B — Ability to move quickly

The fundamental skill that all flaggers need to possess is the ability to move quickly. In traffic control situations, flaggers often need to respond rapidly to changing conditions, including the movement of vehicles and bicyclists or unexpected hazards. Quick and decisive action is essential for ensuring both their safety and the safety of road users. Being able to move quickly allows flaggers to position themselves safely, guide traffic efficiently, and react to any emergencies that may arise in the work zone. While remaining stationary could be necessary for certain tasks, flaggers must also be prepared to reposition themselves as needed. The ability to read maps can be beneficial for overall situational awareness but is not as critical on a basic level for a flagger's immediate tasks. Operating machinery is usually not part of a flagger's duties and requires a different set of skills and training. Thus, moving quickly is paramount for maintaining effectiveness and safety in their role.