When should a signal person use verbal commands instead of hand signals?

Verbal commands should be used when hand signals cannot be clearly understood. This situation can arise due to various factors, such as distance, obstructed views, or poor visibility caused by environmental conditions. When there is a risk that hand signals may not be correctly interpreted, switching to verbal communication ensures that instructions are conveyed clearly and accurately. This is crucial to maintaining safety on the worksite, as misinterpretations can lead to accidents or unsafe conditions.

While poor weather conditions, the operator's experience, and communication with large groups are potentially relevant considerations, these factors do not directly address the primary concern of clarity in communication. Using verbal commands in situations where hand signals might be misinterpreted is an effective means of ensuring safe operations, highlighting the importance of clear communication in the role of a signal person.