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An Articulated Dump Truck (ADT) is a heavy-duty vehicle designed to haul large loads of earth, rock, or other materials over rough, uneven, or soft terrain.

Here are the key things to know about them:

• The "Articulation": Unlike a standard rigid-frame dump truck, an ADT has a pivot point (a hinge) between the cab and the dump box. This allows the front and rear sections to twist independently, keeping all tires in contact with the ground on uneven surfaces.
• Off-Road Capability: Because of the hinge and all-wheel-drive systems, they are built for "off-highway" use. They excel in mud, sand, or steep, unpaved job sites where normal highway trucks would get stuck.
• Purpose: They are primarily used for site preparation, large-scale earthmoving, and transporting material from a "cut" area (where dirt is removed) to a "fill" area (where it is added).

Beginner Terminology:

• Payload: The weight of the material being carried in the box.
• Haul Road: The specific path designated for dump trucks to travel between the loading area and the dumping area.
• Cycle Time: The total time it takes for the truck to get loaded, travel to the dump site, unload, and return for the next load.

If you are looking at your course materials, pay attention to the "rated payload capacity" of the specific model you are studying, as exceeding this can lead to mechanical strain or safety issues.

Study Tip: When reading your textbook, keep a small glossary notebook for equipment-specific terms like "articulation," "cycle," and "payload"—it will make reviewing for quizzes much easier!