Hazmat Labels, Hazmat Placards, and Hazmat Markings - A ... - Labelmaster They must be on all 4 sides - placards need to be displayed on all four sides of a transport vehicle or bulk packaging. They must always be displayed in the square-on-point configuration and be located at least 3 inches away from any other marking that may reduce its effectiveness. This is what a compliant placard vehicle is. Hazmat Markings