Final answer:
A vehicle placarded for hazardous materials is required to have placards on all four sides of the vehicle.
Step-by-step explanation:
A vehicle placarded for hazardous materials is required to have placards on all four sides of the vehicle.
These placards are used to inform emergency responders about the type of hazardous material being transported, allowing them to take appropriate safety measures.
Having placards on all four sides ensures that the information is visible from any direction.