Lexicon of Industrial Vehicles, Heavy Machinery Standards and Military Technology

• Self-propelled — Self-propelled, benefiting from an engine and an internal structural energy source; a machine, vehicle, projectile, or technical system capable of autonomous movement on roads, rails, or in space, without requiring towing, pushing, or a secondary towing vehicle. In industrial and military terminology, it describes a wide range of equipment (such as howitzers, combine harvesters, or cranes) mounted on its own self-propelled chassis.