What should precede an evacuation order from the ISO?

The correct response emphasizes the necessity of issuing an "emergency traffic" message before an evacuation order from the Incident Safety Officer (ISO). This protocol is critical to ensure that all personnel are informed about the imminent danger they may be facing. An "emergency traffic" message is designed to prioritize communication regarding immediate hazards or urgent safety information.

Using "emergency traffic" effectively alerts all responders that a significant safety concern has been recognized, facilitating a swift response and ensuring that all team members comprehend the severity of the situation. This step is crucial in maintaining safety during high-pressure scenarios, where clear communication can significantly reduce the risk of injury or chaos during an evacuation.

The other terms, while important, do not provide the same level of urgency and specificity as "emergency traffic." They may not convey the immediate need for action or the level of alert necessary to prompt an evacuation. Therefore, establishing a clear communication protocol that begins with "emergency traffic" helps to set the stage for effective and timely responses in critical situations.