CDL Hazardous Materials Practice Test

Tankers used to transport hazardous materials on vehicles must be marked with...

1. The UN or NA ID number of the product

2. The manufacturer's logo

3. The weight of the tanker when empty

4. The date of manufacture

The correct answer is: The UN or NA ID number of the product

Tankers carrying hazardous materials must be clearly marked with the UN or NA ID number of the product being transported. This numbering system is essential as it provides critical information about the specific hazardous material contained within the tank. The UN (United Nations) numbers are internationally recognized four-digit codes that identify hazardous substances, while NA (North American) numbers serve a similar purpose within the United States and Canada. The display of these numbers is crucial for emergency responders in the event of an accident or spill. It enables them to quickly understand the nature of the material involved, allowing for appropriate safety measures and response tactics to be employed. Proper identification through these numbers helps to ensure the safety of both the transport personnel and the public, as well as to facilitate effective emergency management. The other choices do not provide the necessary information to identify hazardous materials in an emergency situation. The manufacturer's logo, while it may be useful in other contexts, does not convey the specific hazards associated with the materials being transported. Similarly, the weight of the tanker when empty or the date of manufacture does not offer any relevant information concerning hazardous properties and could lead to confusion in an emergency. Thus, the requirement for UN or NA ID numbers is a vital regulatory measure for safety in the transportation of hazardous materials.