Which of the following is the purpose of the High-Low signaling during incidents?

• A. To signal an evacuation order
• B. To indicate all-clear
• C. To call for medical attention
• D. To request additional resources

Answer: (A)

High-Low signaling is a quick, universal way to issue an evacuation instruction on the incident scene. When this signal is given, everyone in the hazard area is directed to move to a designated safe location, helping to get people out of danger rapidly even in a noisy or chaotic environment. The emphasis is on life safety—clearing the area before conditions worsen. Other communications, like all-clear announcements, requests for medical help, or calls for more resources, use different signals or channels, not this evacuation cue. So the purpose is to quickly and clearly order evacuation to protect personnel and civilians on scene.