What is the purpose of Signal 4?

• A. Need to convey sensitive, confidential, or safety information; move to a private or secure location to receive or send traffic.
• B. Requesting a vehicle stop.
• C. Announcing a break in radio transmissions.
• D. Asking for a supervisor call.

Answer: (A)

Signal 4 means you need to move the conversation to a private or secure channel because the information being discussed is sensitive, confidential, or related to safety. The purpose is to protect privacy and prevent potentially dangerous or compromising details from being overheard on the general radio channel. Use this when discussing undercover operations, plans that could put people at risk, victim information, or any data that should not be broadcast openly. It isn’t about requesting a vehicle stop, breaking transmissions, or calling a supervisor—these require different signals or procedures.