HAZMAT CDL Practice Test

Class A explosives must not be transported in a combination vehicle if the vehicle includes:

1. a placarded cargo tank

2. a flatbed trailer

3. a covered truck

4. a standard pickup

The correct answer is: a placarded cargo tank

Class A explosives are the most dangerous type of explosives and have strict regulations concerning their transportation. According to federal regulations, transporting Class A explosives in combination vehicles that include a cargo tank is prohibited. This is primarily due to the risk of a catastrophic incident should a cargo tank, which is typically used for transporting flammable liquids, be involved in an accident with these highly sensitive materials. The presence of a cargo tank can significantly increase the hazards associated with transporting Class A explosives, leading to potential explosions, fires, or other dangerous situations. For this reason, regulations dictate that Class A explosives should not be transported alongside any configuration that includes a placarded cargo tank, ensuring heightened safety standards are maintained during transport. In contrast, transporting Class A explosives in a flatbed trailer, a covered truck, or a standard pickup doesn't have the same level of risk as those configurations typically do not involve flammable liquids that could react violently.