Which signal requires a supervisor and several units according to police communication procedures?

The signal that requires a supervisor and several units is the one associated with significant incidents that typically command a coordinated response. This particular signal indicates a high-level emergency situation where multiple units must be mobilized, often due to its complexity or the potential for widespread impact on public safety.

In the context of police communication procedures, signals are coded messages that convey specific types of incidents or emergencies. The chosen signal often involves critical scenarios that necessitate the oversight of a supervisor to ensure that the response is managed effectively and efficiently. This structure is essential to consolidate resources, streamline decision-making, and enhance operational effectiveness in potentially dangerous situations.

Signals that typically do not require such a comprehensive response are either less severe or involve matters that can be addressed without the need for extensive multi-unit involvement or supervisory oversight.