Which 10-CODE corresponds to 'Visitors Present'?

• A. 10-11
• B. 10-12
• C. 10-19
• D. 10-20

Answer: (B)

In radio communication, 10-codes are quick shortcuts for common on-scene updates. Saying that there are visitors present communicates that non-staff or guests are at the location, which can influence how you manage the scene, control access, and coordinate with teammates.

This particular code is used to flag that situation clearly and promptly, so dispatch and officers understand the security posture and can respond appropriately, such as by increasing awareness or arranging escorts if needed. The reason this code fits best is that it conveys a specific, non-routine presence at the location without needing a lengthy explanation, enabling faster decision-making.

The other signals in this set are reserved for different updates, like indicating your exact location or returning to base, and would not describe the presence of visitors.