Which characteristic is not essential for flaggers but commonly expected?

Possessing advanced first-aid skills is not considered an essential characteristic for flaggers, even though it may be a desirable skill in certain situations. Flaggers primarily focus on managing and directing traffic safely in work zones to ensure the safety of both the workers and the motoring public. Their key responsibilities include understanding safe traffic practices, giving clear guidance to drivers, and communicating effectively.

While basic first-aid knowledge can be beneficial, especially in emergency situations, it is not a primary requirement for flaggers compared to the other skills listed. Flaggers are trained to handle traffic control situations and are not typically expected to perform advanced medical procedures or maintain a first-aid response in the same way that personnel with specific medical training would. In summary, while having some level of first-aid knowledge can improve a flagger's ability to respond to emergencies, advanced first-aid skills are not core to their role or responsibilities on a worksite.