Signal 15 indicates what action is required?

The correct answer indicates a specific action that members of the Ohio State Highway Patrol communicate during a situation that involves needing assistance or checking in from headquarters. In this context, Signal 15 is used among law enforcement personnel to alert that they need to call home by phone. This signal is essential for maintaining communication, especially when officers encounter situations that require additional support or when they need to report information back to their command center.

The majority of the other options suggest various urgent scenarios, such as requiring backup or being notified about security threats, which would typically correspond to different signals. Understanding these signaling protocols is crucial for ensuring safety among officers and efficient responses to various incidents. The focus should always be on the designated meaning of the signal for effective communication in law enforcement operations.