What is the minimum number of placards required when hazmat is being transported?

• A. 2
• B. 3
• C. 4
• D. 5

Answer: (C)

Placing Hazmat placards is a warning system to signal the type of hazard to other drivers and first responders from any direction. To ensure visibility from all angles, you must display a placard on each side of the vehicle—front, rear, and both sides. A standard vehicle has four sides, so the minimum number of placards is four. If the load includes more than one hazard class, you must place the appropriate placards for each class on every required side, which can increase the total beyond four. But for a single hazard class, four placards meet the minimum requirement.