CDL Hazardous Materials Practice Test

What placard must be used with an inhalation hazard load?

1. Corrosive

2. Flammable

3. Explosive

4. Poison

The correct answer is: Poison

The placard that must be used with an inhalation hazard load is the "Poison" placard. This requirement stems from the nature of the materials classified as inhalation hazards, which are substances that can cause harm through inhalation, posing significant risks to health. The Poison placard signals to all who see it that the material involved can be dangerous if inhaled, necessitating special precautions in handling, storage, and transport. Inhalation hazards typically include toxic substances or chemicals that could be harmful or even lethal if inhaled, thus requiring clear identification for safety purposes. By using the Poison placard, transporters align with regulatory requirements that aim to protect first responders and the public from potential exposure to hazardous materials. The other options, such as Corrosive, Flammable, and Explosive placards, indicate different types of hazards. Corrosive substances can damage living tissue and materials upon contact, Flammable substances are capable of catching fire easily, and Explosives can detonate under certain conditions. Each of these has distinct characteristics and risks and is not suitable for identifying inhalation hazards, which is why the Poison placard is specifically designated for this purpose.