Freight Dispatching Terminology Practice Test 2026 - Complete Exam Prep

In freight terms, the pulling machine that attaches to and moves a trailer is the tractor, often labeled as a truck/tractor. This equipment is what actually provides the power to move loaded or empty trailers and can be swapped onto a trailer if the original tractor is disabled, allowing the load to continue. The phrase “truck/tractor” specifically identifies that piece of equipment—the power unit that pulls the trailer—without implying anything about the trailer itself or the driver.

Other terms can be more general or refer to different concepts. A power unit is the engine-based vehicle that provides the pulling power, but the label isn’t as precise for identifying the specific equipment as the standard term for the pulling vehicle. Power Only/Power Unit tends to describe scenarios where only the pulling unit is provided (without a trailer) or is used as a broader designation for the power-providing unit, rather than the defined equipment type. And a truck driver refers to the person operating the vehicle, not the equipment itself.