Why are placards used on vehicles?

Placards are essential for indicating the presence of hazardous materials being transported by a vehicle. They serve as visual warnings to others on the road and emergency responders about the specific nature of the materials being carried. This information is critical for safety, as it informs people of potential dangers, such as flammability, toxicity, or radioactivity, allowing them to take appropriate precautions. By using standardized colors and symbols, placards ensure that anyone interacting with the vehicle—be it in a routine circumstance or an emergency situation—can quickly recognize the risk involved. This plays a vital role in maintaining public safety, reducing the risk of accidents, and ensuring proper handling during emergencies.