Box Trucks
Box trucks or trailers are common through out the US. They often carry bulk and/or non-bulk quantities of hazardous materials of all nine-hazard classes. In some cases, they do not show placarding or markings as some hazardous materials do not require placarding below certain quantities. Visible clues as to the presence of hazardous materials might be the name of the carrier or visible placard holders on the outside of the trailer and truck.
Top image of a tractor trailer rig with cutouts exposing illustrations of hazardous materials placards. Bottom image is a tractor trailer rig shown from the rear, grey with a blue stripe and “Averitt Express” logo on a blue field.