What is the primary purpose of using placards on transport vehicles?

The primary purpose of using placards on transport vehicles is to identify the type of hazardous material being transported. Placards serve as a visual indicator that conveys critical information about the nature of the cargo, including its hazardous properties. This identification is crucial for emergency responders in the event of an incident, as it allows them to quickly assess the risks associated with the material and take appropriate safety measures.

By providing clear, recognizable symbols and labels, placards help ensure the safety of not only the transport vehicle but also other road users, the environment, and emergency personnel who may need to respond to a transportation incident involving hazardous materials. This practice is mandated by regulations to ensure uniformity and clear communication across the transportation industry.