What does an orange placard signify in hazardous materials transportation?

An orange placard in hazardous materials transportation specifically signifies explosive substances. This designation is crucial for ensuring safety during the transportation of these highly dangerous materials, as explosives pose significant risks of detonation if not handled and stored correctly. The use of color-coding, such as the orange placard, is part of a standardized system that helps first responders, transporters, and the general public quickly identify the type of hazard associated with the materials being transported.

Understanding the significance of placard colors allows individuals and organizations to respond appropriately in emergencies. For instance, a hazardous materials incident involving an orange placard would prompt emergency responders to take specific precautions regarding evacuation distances and safety measures, given the potential for explosions.