A tractor unit, traction unit, road tractor or prime mover is a heavy-duty vehicle, usually with a powerful engine and several axles. The tractor unit serves as a method of moving trailers. Trailers can be swapped between tractor units quickly so the unit does not stand idle whilst the load is unloaded or loaded, unlike a rigid, and is not restricted to one type of goods as trailer types can be swapped e.g. Bulk tipper to a box van. The tractor-trailer combination also means that a load can be shared across many axles, yet be more maneuverable than an equivalently sized rigid truck. The tractor unit couples to the trailer using some sort of mechanical lock system, usually a fifth wheel. A tractor unit is primarily designated a freight vehicle and is most common in the heavy goods vehicle c
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| - A tractor unit, traction unit, road tractor or prime mover is a heavy-duty vehicle, usually with a powerful engine and several axles. The tractor unit serves as a method of moving trailers. Trailers can be swapped between tractor units quickly so the unit does not stand idle whilst the load is unloaded or loaded, unlike a rigid, and is not restricted to one type of goods as trailer types can be swapped e.g. Bulk tipper to a box van. The tractor-trailer combination also means that a load can be shared across many axles, yet be more maneuverable than an equivalently sized rigid truck. The tractor unit couples to the trailer using some sort of mechanical lock system, usually a fifth wheel. A tractor unit is primarily designated a freight vehicle and is most common in the heavy goods vehicle c
- A tractor unit, traction unit, road tractor or prime mover (Australian English) is a heavy-duty vehicle, usually with a large diesel engine and several axles. The tractor unit serves as a method of moving trailers. Trailers can be swapped between tractor units quickly so the unit does not stand idle whilst the load is unloaded or loaded, unlike a rigid, and is not restricted to one type of goods as trailer types can be swapped e.g. Bulk tipper to a box van. The tractor-trailer combination also means that a load can be shared across many axles, yet be more manoeuvrable than a equivalently sized rigid truck (see trucks). The tractor unit couples to the trailer using some sort of mechanical lock system, usually a fifth wheel. A tractor unit is primarily designated a freight vehicle and is mos
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| - A tractor unit, traction unit, road tractor or prime mover (Australian English) is a heavy-duty vehicle, usually with a large diesel engine and several axles. The tractor unit serves as a method of moving trailers. Trailers can be swapped between tractor units quickly so the unit does not stand idle whilst the load is unloaded or loaded, unlike a rigid, and is not restricted to one type of goods as trailer types can be swapped e.g. Bulk tipper to a box van. The tractor-trailer combination also means that a load can be shared across many axles, yet be more manoeuvrable than a equivalently sized rigid truck (see trucks). The tractor unit couples to the trailer using some sort of mechanical lock system, usually a fifth wheel. A tractor unit is primarily designated a freight vehicle and is most common in the heavy goods vehicle class of vehicles although smaller van based tractor units do exist.
- A tractor unit, traction unit, road tractor or prime mover is a heavy-duty vehicle, usually with a powerful engine and several axles. The tractor unit serves as a method of moving trailers. Trailers can be swapped between tractor units quickly so the unit does not stand idle whilst the load is unloaded or loaded, unlike a rigid, and is not restricted to one type of goods as trailer types can be swapped e.g. Bulk tipper to a box van. The tractor-trailer combination also means that a load can be shared across many axles, yet be more maneuverable than an equivalently sized rigid truck. The tractor unit couples to the trailer using some sort of mechanical lock system, usually a fifth wheel. A tractor unit is primarily designated a freight vehicle and is most common in the heavy goods vehicle class of vehicles, although smaller van based tractor units do exist. In Halo: Reach, the HuCiv HC1500 tractor unit is an available drivable vehicle on some campaign levels. It is prone to oversteer similar to other civilian vehicles in the game, and it goes about half the speed of a Mongoose.
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