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On a two-axle truck, what is the forward distance?
两轴卡车的前向距离如何定义？
Forward distance on a rigid vehicle excludes folding mirrors.
刚性车辆前向距离的测量不包括可折叠后视镜。
阅读相关知识
Measure from the rear axis to the front of the vehicle or load, whichever is further forward. The front axle is not the rear reference point.
从后轴基准线量到车辆或货物最前端，以较前者为准；不能把前轴当成后方基准。