1. Strong load capacity: the tractor semi-trailer adopts a combination of tractor and trailer, and the number and length of the trailer can be adjusted according to needs, so as to achieve different load capacity. Compared with other types of trucks, towed semi-trailers have a larger load capacity and are suitable for long-distance transportation and the transportation of large quantities of goods. 2. High flexibility: the traction semi-trailer has high flexibility and can be combined and disassembled according to actual needs. The trailer can be selected according to the different characteristics of the goods, such as flat trailer, van trailer, tank trailer, etc., to meet different transportation needs. At the same time, the number and length of trailers can also be adjusted as needed to adapt to different road and transport conditions. 3. Convenient operation: The operation of the tractor is relatively simple, and only one tractor is needed to control the driving of the entire vehicle group. The tractor and trailer are connected through trailer connectors (such as trailer head, trailer seat, etc.) to facilitate traction and separation. This mode of operation greatly reduces the difficulty and risk of the driver's work. 4. High economy: the traction semi-trailer has higher economy compared to the bicycle truck. One tractor can be used with multiple trailers, reducing the number and cost of tractors. At the same time, the loading capacity of the trailer is also larger than that of the single-vehicle truck, and more goods can be transported at one time, improving transportation efficiency and economic benefits.