CDL Hazardous Materials Practice Test

For a vehicle containing 500 pounds each of Explosives 1.1 and 1.3, what placarding is necessary?

1. Danger placards

2. Explosives 1.2 placards

3. Explosives 1.1 placards

4. Hazardous materials placards

The correct answer is: Explosives 1.1 placards

When transporting hazardous materials, placarding is essential for ensuring safety and compliance with regulations. In this scenario, the vehicle contains 500 pounds each of Explosives 1.1 and 1.3. According to the regulations governing the transportation of hazardous materials, the placarding requirement primarily focuses on the most dangerous classification of the materials being transported. Explosives categorized as 1.1 are considered the most dangerous due to their potential for mass detonation and their ability to pose significant risks to public safety and property. For a mixed load containing materials classified as different types of explosives—1.1 and 1.3—the most stringent placarding requirement applies. In this case, since the load includes Explosives 1.1, which are more hazardous than Explosives 1.3, the correct placard that must be displayed on the vehicle is the one designated for Explosives 1.1. Furthermore, while other placards such as Danger placards or general hazardous materials placards may indicate risk, they do not specifically designate the type of explosives being transported. Hence, they would not meet the regulatory requirements that pertain specifically to the hazardous materials involved. Thus, displaying the Explosives 1.