Loading and Unloading Hazardous Materials
Loading rules exist to prevent incompatible materials from mixing and to keep the load stable. The candidate must know the segregation table concept: certain classes cannot be loaded together (for example, cyanides and acids, or oxidizers near flammables). Always check compatibility before loading. Secure every package against movement-blocking and bracing-and never load hazmat on top of or against food, feed, or anything intended for human or animal consumption unless the package is designed for it. Cargo heaters must be shut off or controlled when carrying flammable materials. Questions love the "do not load" traps: never load damaged packages (leaking, broken seals, stained labels), and never accept a package without proper marking/labeling. When loading poisonous (Class 6) or infectious substances, keep them away from food and separate from other cargo. Also know that the shipper is responsible for correct classification and packaging, while the driver/loader is responsible for checking that packages are intact and properly marked before loading. Rule of thumb: if a package is leaking, damaged, or unmarked, refuse it-do not "fix it" and load. Worked example: A shipper offers a drum of sulfuric acid (Class 8) with a torn label and a slow drip. The correct action is to refuse the shipment and notify the shipper; you do not re-label or tape it yourself.