Tractors can be classified according to different classification methods: According to the form of the cab: Long head type: The engine is arranged in front of the driver’s seat, and the driver is less affected by engine vibration, making it safer in collisions, but the body is longer. Flat head type: The engine is located under the driver’s seat, the body is relatively short, the turning radius is small, but the driver’s comfort is poor. By number of axles: Double axis type: generally used for towing semi-trailer of 20 foot containers, with a short body, small wheelbase, and good maneuverability. Three axle type: used for towing semi trailers of 40 foot containers, with high load-bearing capacity and traction force. By purpose: For highway transportation: suitable for high-speed and long-distance transportation, using high-power engines and high speeds. Used for short distance transportation in ports or freight yards, with high traction and low speed. Specific types and characteristics Long head tractor: The engine is arranged in front of the driver’s seat, and the driver is less affected by engine vibration, making collisions safer. However, the body is longer and the turning radius is larger. Flat head tractor: The engine is located under the driver’s seat, the body is relatively short, the turning radius is small, but the driver’s comfort is poor. Dual axle tractor: Generally used for towing a 20 foot container semi-trailer, the body is shorter, the wheelbase is small, and the maneuverability is good, but the rear axle is a single axle with lower load-bearing and traction force. Three axle tractor: A semi-trailer used for towing 40 foot containers, with a double axle rear axle and high load-bearing capacity and traction force, suitable for long-distance transportation. Tractors for highway transportation: Equipped with a high-power engine and high speed, suitable for high-speed and long-distance transportation, with good braking and acceleration performance. Tractor for freight yard transportation: Used for short distance transportation in ports or freight yards, with low speed and high traction, suitable for short distance transportation.