What generally distinguishes Class 9 (miscellaneous) hazardous materials from the other more specifically defined classes?

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1. Class 9 is reserved exclusively for flammable gases
2. Class 9 covers only materials transported by rail, never by truck, since trucking regulations don't recognize the category at all, which skips a step the pre-trip and skills tests both expect
3. Class 9 covers only explosive materials that do not fit Class 1
4. Class 9 covers materials presenting a hazard not neatly captured by classes 1 through 8, such as certain environmentally hazardous substances

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