What must vehicles transporting certain hazardous materials display?

Vehicles transporting hazardous materials are required to display placards indicating the class of the material being transported. These placards serve crucial functions in ensuring safety and compliance with regulations. By clearly showing the specific class of hazardous materials, they allow for the immediate identification of the type of danger posed — whether it is explosive, flammable, corrosive, or another hazard. This information is vital for emergency responders in case of an incident, as it helps them assess the situation and employ the appropriate safety measures.

The use of placards is established under the Code of Federal Regulations (CFR), specifically in 49 CFR Part 172. The correct placarding ensures that everyone, including other drivers and emergency personnel, is aware of the potential dangers associated with the cargo. This system is essential for promoting safety during transport and minimizing risks to public health and the environment.