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Understanding the meanings of terms used in the Hazardous Materials Regulations and their manner of usage can simplify the overall understanding of the regulations.
Anyone using the Hazardous Materials Regulations (HMR) must understand the words or terms used within the HMR. The HMR includes sections that explain the definitions and terms to help users better understand the regulations.
In general, definitions of most words and phrases used in the regulations are given in 171.8, referenced elsewhere, or both. To illustrate the latter, hazard class definitions are listed in two ways in 171.8: by their class and/or by name, e.g., “Class 3” and “flammable liquid,” and then the reader is referred to Part 173.
Rules of construction.