If a placard is visible, but no product name or four digit United Nations (UN) number is given, how is the relevant page of the Emergency Response Guidebook determined?

When determining the relevant page of the Emergency Response Guidebook without a product name or UN number, the correct approach is to use the table of placards, which lists guide numbers based on the specific placard displayed. Each placard corresponds to particular hazards associated with dangerous goods, and the table facilitates quick identification of appropriate response information.

Using the guide number derived from the placard ensures that first responders have access to the most accurate and relevant safety information according to the nature of the hazard indicated by the placard. This method is crucial for making informed decisions in emergency situations, ensuring proper handling and response procedures are followed.

Other options focus on different sections or numbering systems within the Emergency Response Guidebook, but they would not provide the direct, placard-based linkage necessary when specific product details are not available. Thus, relying on the table of placards is the most efficient and accurate method in this scenario.