What is the significance of the 'High-Low' tones?

• A. They are used to signal an evacuation order
• B. They indicate a routine status update
• C. They signal all-clear
• D. They denote a medical emergency

Answer: (A)

High-low tones serve as a clear, urgent audible cue that an evacuation is in effect. The two-tone pattern is chosen because it cuts through noise and radio chatter, grabbing attention quickly and signaling responders and occupants to move to a safe area without delay. This signal is specifically associated with evacuating procedures, rather than routine updates or all-clear indications, so it prompts immediate action. When you hear it, shift to evacuation mindset, follow command directions, and head to the designated assembly point. Other signals would be used for less urgent updates or to indicate that it’s safe to resume normal activities.