Placards on a vehicle must be:

• A. Placed on all four sides of a vehicle
• B. Placed on the rear only
• C. On the left side only
• D. In the cab only

Answer: (A)

Hazardous materials placards must be visible from all directions so that other drivers and responders can quickly recognize the danger no matter which way a vehicle is approaching or viewed. Because a vehicle can be seen from the front, the rear, and on both sides, the placards should be placed on all four sides to ensure the warning is always visible. Placing placards only on the rear, only on one side, or only inside the cab would fail to provide this 360-degree warning and could violate regulations.