What color placard indicates a vehicle is transporting nonflammable compressed gas?

• A. Red
• B. Green
• C. Yellow
• D. Blue

Answer: (B)

The placard for transporting nonflammable compressed gas is indeed green. This color designation is part of the Hazardous Materials Identification System, which standardizes the visual identification of various hazardous materials. Nonflammable compressed gases, such as nitrogen, helium, or carbon dioxide, need a specific warning to inform responders and the public that although these gases do not ignite, they can still pose other risks such as pressure hazards or asphyxiation in confined spaces.

In this system, red is typically associated with flammable materials, yellow is often used for reactive materials, and blue generally indicates health hazards. Thus, the green placard clearly indicates that a vehicle is transporting a nonflammable compressed gas, helping to ensure safety and proper response by emergency personnel in case of an incident.