Which type of incident typically requires a multiple-alarm response?

Multiple-alarm responses are typically initiated for large structure fires or hazardous materials incidents due to the scale and complexity of these situations. Such incidents often involve significant fire activity, the potential for rapid escalation, and the need for extensive resources, including multiple fire engines, ladder trucks, and specialized units.

Large structure fires, for example, can present challenges such as high heat, heavy smoke, and the risk of building collapse, all of which necessitate a greater number of personnel and equipment to ensure effective fire suppression and safety. Additionally, hazardous materials incidents might involve toxic substances or environmental threats that require expert handling and containment, further justifying the need for increased resources.

In contrast, medical emergencies, small brush fires, and traffic accidents typically involve situations that can be managed with fewer resources, generally falling within the capabilities of basic emergency response teams. Thus, while each of these scenarios is critical, they do not usually require the extensive resources associated with a multiple-alarm response.