How is a hazardous material defined according to the HMR?

A hazardous material is defined according to the Hazardous Materials Regulations (HMR) as a material that poses an unreasonable risk to health, safety, and property when transported. This definition encompasses a broad range of substances that, due to their chemical properties or nature, could potentially lead to significant harm, including injury, damage, or environmental impact if not handled correctly during transportation.

This definition emphasizes the potential dangers associated with transporting certain materials, highlighting the importance of proper handling, packaging, and transportation procedures to mitigate these risks. Recognizing the inherent hazards of these materials is essential for ensuring safety for transporters, emergency responders, and the public, thereby reinforcing the need for stringent regulations in this area.

The other options do not align with the regulatory definition; they either downplay the risks associated with certain substances or imply that safety is guaranteed without specific measures, which contradicts the intent of the regulations aimed at managing hazardous materials effectively.