Class A Commercial Driver License (CDL) HAZMAT Endorsement Practice Exam

The main idea here is how hazmat information is communicated at different scales. Hazard labels are attached to each individual package to show what specific danger that package poses. Placards, on the other hand, go on the outside of the whole vehicle to warn others about the overall load the vehicle is carrying.

So the best fit is: the labels go on the individual packages, while the placard is placed on the vehicle for the load. Placards are not limited to the driver’s door and aren’t used in place of package labels; they cover the entire shipment on the vehicle and are designed to be seen from the outside.