What is the evacuation signal for a structural collapse incident?

The evacuation signal for a structural collapse incident is typically a continuous sounding of the air horn or the emergency warning signal. This signal is crucial because it communicates the immediate need for all personnel to evacuate the area due to potential danger from a collapse. Continuous sounding effectively captures attention and is recognized as an urgent call to abandon the area.

In contrast, one long blast for 10 seconds is often used in different contexts, such as indicating a stop or a warning rather than specifically calling for full evacuation in imminent danger situations like structural collapse. Other choices, such as two consecutive short blasts or three short blasts, may have their own meanings within different protocols but do not pertain specifically to high-risk evacuation scenarios. Therefore, understanding the proper signal for structural collapse is vital for ensuring the safety and quick response of all personnel on-site.