How large must a hazardous materials placard be at a minimum?

The minimum size for a hazardous materials placard is 10 x 10 inches. This size is established to ensure that the placard is clearly visible and legible from a distance, which is critical for the safety of first responders and others who may be in proximity to the vehicle transporting hazardous materials. This visibility facilitates quick identification of the potential risks involved with the materials being transported, allowing for appropriate safety measures and emergency responses.

Other sizes presented do not meet the regulatory requirements set forth in hazardous materials transportation guidelines, which emphasize the importance of clear and recognizable signage for public safety.