Which description correctly defines a cargo tank under hazardous-material transportation rules?
Correct answer: D – A bulk tank for liquids or gases that is attached to a motor vehicle or remains on it during loading and unloading
Under 49 CFR, a cargo tank is bulk packaging intended primarily to carry liquids or gases. It is permanently attached to or forms part of a motor vehicle, or its size, construction, or attachment allows it to be loaded and unloaded without removal. The California handbook uses this complete definition, distinguishing cargo tanks from portable tanks and vehicle fuel tanks.
Source: California Commercial Driver Handbook — § 9.8.1, “CFR, Title 49 § 171.8—Definitions and Abbreviations”, 49 CFR § 171.8 — Definitions and abbreviations

