When should apparatus drivers activate their air horns?

Apparatus drivers should activate their air horns during both an emergency evacuation and a systematic withdrawal to effectively communicate important messages and commands to those in the vicinity. The sound of the air horn can be crucial in situations where visual communication is difficult due to smoke, darkness, or chaos.

In an emergency evacuation, the air horn serves as an alert for personnel to leave the area swiftly and safely, enhancing overall safety during a critical moment. Similarly, during a systematic withdrawal, the horn can signal to team members that it's time to exit the scene and can help coordinate efforts to ensure no one is left behind.

Using the air horn under these specific circumstances emphasizes the importance of clear, audible signals in managing emergency situations effectively, ensuring the safety of firefighters and civilians alike.