A tractor trailer hauling gasoline should display a placard with the hazard class Red, 3.

A tractor trailer hauling gasoline should display a placard with the hazard class Red, 3.

• A. Blue, 2
• B. Red, 3
• C. White, 6
• D. Yellow, 4

Answer: (B)

Gasoline is a flammable liquid, so it falls under hazard class 3. The placard for this class uses a red background and the number 3, often with a flame symbol, to signal fire risk at a glance. That color and number together tell responders and transport personnel exactly what kind of hazard is present. Other color/number combinations would indicate different hazard classes (for example, other colors correspond to other types of hazards), so they wouldn’t be appropriate for gasoline. In short, the red placard with the number 3 correctly communicates that gasoline is a Class 3 flammable liquid.

Gasoline is a flammable liquid, so it falls under hazard class 3. The placard for this class uses a red background and the number 3, often with a flame symbol, to signal fire risk at a glance. That color and number together tell responders and transport personnel exactly what kind of hazard is present. Other color/number combinations would indicate different hazard classes (for example, other colors correspond to other types of hazards), so they wouldn’t be appropriate for gasoline. In short, the red placard with the number 3 correctly communicates that gasoline is a Class 3 flammable liquid.