A truck, officially known as a freight vehicle or cargo vehicle, commonly referred to as a goods vehicle, is a type of commercial motor vehicle specifically designed for transporting goods or performing special operations, distinguishing it from passenger cars primarily intended for carrying passengers. It typically features a separate cabin and cargo area, using a non-load-bearing body (frame structure) to provide greater load capacity and durability.

1. Core Definition and Key Features

   • Essential Attribute: The core function is cargo transportation, capable of towing trailers to form a vehicle train and bearing part of the trailer's weight.
   • Structural Characteristics:
     • Closed cabin + open/closed cargo box
     • Non-load-bearing body (frame structure), distinguishing it from the load-bearing body of passenger vehicles
     • Primarily uses diesel engines (mainly for heavy-duty vehicles), offering strong power, high torque, and good fuel economy
     • Reinforced chassis structure, with a suspension system suitable for heavy loads
   • Legal Definitions:
     • China: Vehicles primarily used for transporting goods, categorized by total weight into micro, light, medium, and heavy types.
     • Europe: Vehicles with at least four wheels for cargo transport, with a total weight exceeding 3.5 tons, classified into N2 (3.5-16 tons) and N3 (>16 tons).
     • USA: Classified by Gross Vehicle Weight Rating (GVWR), covering light, medium, and heavy trucks.

2. Core Functions and Application Scenarios

   Function Type	Typical Applications	Representative Models
   General Cargo Transport	Urban delivery, trunk logistics, intercity freight	Flatbed trucks, box trucks, van trucks
   Special Cargo Transport	Cold chain, hazardous materials, liquids/gases, oversized cargo	Refrigerated trucks, tankers, flatbed trucks,  lowboy trailers
   Engineering Operations	Site loading and unloading, mining transport, road construction	Dump trucks,  concrete mixers, truck-mounted cranes
   Special Services	Firefighting, rescue, sanitation, emergency power repair	Fire trucks, tow trucks,  water trucks,  emergency response vehicles
   Towing Operations	Long-distance trunk transport,  container transport	Semi-trailers, full trailers

3. Main Classification Methods (Review)

   • By Total Weight: Micro (≤1.8 tons), Light (1.8-6 tons), Medium (6-14 tons), Heavy (>14 tons)
   • By Fuel Type: Fuel (gasoline/diesel), New Energy (pure electric/hybrid/fuel cell), Gas (CNG/LNG)
   • By Axle Count: 2 axles, 3 axles, 4 axles and above, determining the maximum allowable total weight (e.g., 6-axle vehicles ≤49 tons)
   • By Drive Type: 4×2, 6×2, 6×4, 8×4, etc. (front number = total number of wheels, rear number = number of driven wheels)
   • By Cargo Box Structure: Flatbed, stake, box, van, tanker, dump truck, etc.

4. Social Value of Trucks Trucks are the core pillar of the modern logistics system, responsible for about 70% of global cargo transport. They connect the entire chain of production, warehousing, and distribution, serving as a key tool for ensuring supply chain smoothness. From light delivery vehicles for the "last mile" in cities to heavy-duty tractors for intercontinental transport, the truck family covers almost all logistics demand scenarios and plays an irreplaceable role in national economic development.

5. Differences from Other Similar Vehicles

   Vehicle Type	Core Differences
   Pickup Truck	Combines passenger and cargo functions, total weight usually ≤3.5 tons,  classified as light trucks
   Trailer	No power unit, needs to be towed by a tractor, cannot drive independently
   Special Operation Vehicles	Mainly intended for engineering operations (e.g., cranes, excavators), not solely for cargo transport
   Agricultural Vehicles	Primarily used for agricultural production, technical standards and application scenarios differ from highway trucks