Which document should be available on a fire vehicle to assist in identifying placards?

The Emergency Response Guidebook is specifically designed to assist first responders in identifying hazardous materials and their associated placards. This guide provides critical information such as the hazard class of materials, emergency handling information, and basic responses to potential incidents involving hazardous substances. The guidebook is a vital resource during emergencies when quick identification is essential for safe and effective response.

Having this document on a fire vehicle ensures that personnel are equipped with up-to-date information on how to handle situations involving hazardous materials, thereby enhancing safety for both responders and the public. This focus on quick identification and appropriate responses is what makes the Emergency Response Guidebook the most relevant document in this context.