Do You Know What Is A Tractor?

ITractor trailer is between the front end and the box is towed by tools in general large trucks or semi-trailers, that is, the car front end can be detached from the original box and traction of other boxes, and the box can also be detached from the original head to be towed by the other head. The front has the ability to drive the front end is called the tractor, the back does not have the ability to drive the car is called the trailer, the trailer is towed by the tractor to go. Tractor and trailer connection there are two kinds of: the first is the front half of the trailer on the tractor trailer above the rear section of the traction saddle, the bridge behind the tractor trailer to bear part of the weight of the trailer, this is a semi-trailer; the second is the front end of the trailer connected to the back end of the tractor trailer, the tractor trailer only to provide the forward pulling force, dragging the trailer to go, but does not bear the downward weight of the trailer, which is the full trailer.
Often used for the transport of large quantities of goods within or between workshops, such as the transport of warehouses in the automobile manufacturing industry to assembly lines, the transport of baggage at airports.