In that case, the radioactive materials will pollute the atmosphere.

The DOT (Department of Transportation) class for radioactive materials is Hazardous. The specific Hazard number will be determined by the exact name of the radioactive materials. Special permits and placarding are needed for vehicles carrying hazardous materials. The DOT class is categorized into 9 classes according to hazardous materials transportation. Class 7 is the general DOT class for radioactive materials.

Radioactive materials decay at predictable rates

Hazard Class 7 is the class for radioactive materials.

"The distinctive symbol used to identify radioactive materials is the