An 18-wheeler is a large, commercial vehicle that has 18 wheels. It is also known as a semi-truck, tractor-trailer, or big rig. An 18-wheeler consists of a truck and a trailer. The truck is the front part of the vehicle and it contains the engine, driver's cab, and fuel tanks. The trailer is the back part of the vehicle and it carries the load.
Rig
The term "rig" can refer to the entire 18-wheeler, or it can refer to just the truck. When it refers to the entire vehicle, it is used in a general sense and does not specify whether it is a truck and trailer or a tractor-trailer. When it refers to just the truck, it is used in a more specific sense and it means the truck without the trailer.
Truck and Trailer Tractor
A truck and trailer is a type of 18-wheeler that has a truck and a trailer that are separate units. The truck is the front part of the vehicle and it contains the engine, driver's cab, and fuel tanks. The trailer is the back part of the vehicle and it carries the load. The trailer is attached to the truck by a fifth wheel coupling.
A tractor-trailer is a type of 18-wheeler that has a truck and a trailer that are connected by a semi-trailer. The truck is the front part of the vehicle and it contains the engine, driver's cab, and fuel tanks. The trailer is the back part of the vehicle and it carries the load. The tractor-trailer is also known as a semi-truck.
