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Tractor trailer

A semi-trailer truck, tractor-trailer, 18-wheeler, semi, or big-rig known as a transfer truck. semi tractors usually have 3 axles, the front, or "steer", axle having two wheels, and each of the two rear, "drive", axles having a pair of "dualies" (double) wheels on each side. Thus, the most common configuration of tractor has 10 wheels. A semi-trailer is a trailer without a front axle. A large proportion of its weight is supported either by a road tractor or by a detachable front axle assembly known as a dolly. A semi-trailer is normally equipped with legs which can be lowered to support it when it is uncoupled. A road tractor coupled to a semi-trailer is often called a semi-trailer truck or semi.

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