Final answer:
A vehicle hauling hazmat is required to display four identical placards on the sides and rear of the vehicle.
Step-by-step explanation:
A vehicle hauling hazardous materials (hazmat) is required to display four identical placards on the sides and rear of the vehicle. These placards are used to indicate the presence of hazardous materials and the specific type of hazard they pose. Each placard must be a specific size and design, according to the United States Department of Transportation (DOT) hazardous materials regulations.
For example, if a vehicle is transporting flammable materials, it must display placards that depict the Flammable symbol and the UN number for the specific material being transported. This helps emergency responders quickly identify the hazards and take appropriate actions in case of an accident.
The purpose of displaying multiple placards is to ensure visibility from different angles, so that other drivers, emergency responders, and relevant authorities can easily identify the hazmat being transported and take necessary precautions.