What is the speed of a tractor unit?
1 Answers
In the market, the maximum speed of tractor units depends on the specific model, with different models having varying speeds, typically around 100 kilometers per hour. Taking the Sinotruk Huanghe brand ZZ4184K3616D1 tractor unit as an example, this vehicle has a top speed of 95 km/h without a speed limiter, but only 79 km/h with a speed limiter installed. Most imported tractor units and some domestic high-end tractor units are already equipped with speed limiters. Once the speed exceeds the limiter's setting, the engine stops injecting fuel, meaning the top speed of a tractor unit isn't necessarily determined by its power alone. Tractor units can have multiple axles according to axle load regulations, with the most common configurations being 4×2, 6×2, and 6×4. However, some manufacturers offer 6×6, 8×4, 8×6, 8×8, 10×8, and 10×10 axle configurations. A 6×4 unit has three axles—typically an undriven front steering axle and two rear driven axles. The 6×4 configuration is more common for long-haul transportation in larger countries like the United States and Australia, while 4×2 and 6×2 units are more prevalent in Europe. Heavy-duty tractor units (such as those used for heavy transport and road trains) often feature four or more axles and drive more than two axles. In certain countries (e.g., Switzerland), a certain weight must be distributed across the driven axles, leading to the emergence of heavier variants with six-wheel drive. Otherwise, an additional tractor unit is required. Heavy-duty variants of tractor units can be converted into ballast tractors by installing temporary ballast, which requires special permits.
