As used in this part, unless the context otherwise requires:

“Hazardous material” means a substance or material which has been determined by the United States Secretary of Transportation to be capable of posing an unreasonable risk to health, safety, and property when transported in commerce, and which has been so designated. The term includes hazardous substances, hazardous wastes, infectious substances, medical wastes, marine pollutants, elevated temperature materials, and materials that meet the defining criteria for hazard classes and divisions in Title 49 of the Code of Federal Regulations, Part 173.

“Hazardous materials incident” means an occurrence or likely occurrence or potential of a spill, release, leakage, dumping, or loss of control of a hazardous material during the course of transportation in commerce including loading, unloading, or temporary storage.

“Hazardous substance” means any material, including its mixtures and solutions, defined under Title 49 of the Code of Federal Regulations, Part 171.

“Hazardous waste” means any material designated in Title 40 of the Code of Federal Regulations, Part 261 and which are subject to the hazardous waste manifest requirements of Title 40 of the Code of Federal Regulations, Part 262.

“Infectious substance” means a viable microorganism, or its toxin, which causes or may cause disease in humans and animals, or which is further described as an infectious substance in Title 49 of the Code of Federal Regulations, Part 173.

“Medical waste” means for transportation purposes, shipments of medical waste material generated in the diagnosis, treatment, or immunization of human beings and animals, in research pertaining thereto, in the production or testing of biologicals, or which are further described as regulated medical waste in Title 49 of the Code of Federal Regulations, Part 173.