General Knowledge · Hazardous Materials Rule for All Commercial Drivers
How does federal regulation organize hazardous materials for shipping and placarding purposes?
1.Into nine hazard classes, such as Explosives, Gases, Flammable and Combustible Liquids, and Corrosive Materials, each requiring its own placardCorrect answer
2.Into only three broad categories: flammable, toxic, and radioactive, with every other kind of hazard folded into one of those three broad classes alone
3.Classes are assigned individually by each shipper, since there is no standard federal list at all for them to work from whenever they load a trailer
4.Hazard class only matters for air transport, and not for highway transport, where placarding instead follows an entirely separate federal scheme
Explanation
Federal regulation organizes hazardous materials into nine hazard classes, including Explosives, Gases, Flammable and Combustible Liquids, Flammable Solids, Oxidizers, Poisonous Materials, Radioactive Material, Corrosive Material, and Miscellaneous, under 49 CFR 173.2, and each class requires its own specific placard design. The wrong options each shrink or misapply this system: three categories is far fewer than the actual nine, the classes are a standardized federal list rather than a shipper's individual choice, and the classification system governs highway placarding just as much as any other mode.
Source: 49 CFR 173.2
Related Hazardous Materials Rule for All Commercial Drivers questions
- What must a driver hold to operate a commercial motor vehicle used to transport hazardous materials as defined by federal regulation?
- For CDL purposes, what makes a material a "hazardous material" requiring an endorsement to transport?
- Where must placards be displayed on a vehicle or container carrying a quantity of hazardous material that requires placarding?
- What does federal regulation require before a driver may receive a hazardous materials endorsement and transport hazardous cargoes?