Which statement best describes Code 4 in radio traffic?

• A. Emergency response with lights and siren.
• B. All clear; no further assistance needed.
• C. Traffic accident.
• D. Signal good.

Answer: (B)

Code 4 means the scene is under control and no additional units are needed. This status tells everyone on the radios—dispatch, responding officers, and units nearby—that the incident has been contained, hazards are assessed or resolved, and resources can be stood down or redirected. It’s a signal that no further assistance is required, which is why it’s described as All clear; no further assistance needed.

This differs from an emergency response with lights and siren, which signals active, urgent action is still required. It also isn’t simply labeling a traffic accident unless the scene has been secured and no more help is needed. And it isn’t just a generic “signal good”; Code 4 specifically communicates that the incident is finished from the perspective of resource deployment.