More than one Placard indicates more than one hazard; how are the placards arranged to convey the most prominent hazard?

• A. The leftmost hazard is deemed the most hazardous
• B. The leftmost hazard is the least hazardous property of the substance
• C. The placards are arranged randomly
• D. The top placard indicates the most dangerous

Answer: (A)

When more than one hazard placard is required, the most important goal is to communicate the greatest danger first. The leftmost placard is treated as the most prominent indicator of hazard, so it should display the highest-risk property of the substance. This arrangement lets someone approaching the vehicle or container instantly grasp the primary risk, even before scanning the other hazards. The remaining placards are then placed to the right to show additional hazards in order of decreasing severity. This standard left-to-right ordering helps ensure a quick, clear understanding for responders, rather than relying on random placement or a top-position rule.