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Between which points is the forward distance of a semi-trailer measured?
半掛車的前向距離是在哪兩個基準點之間測量的？
A semi-trailer's forward distance is measured from its rear axis to the centre of the kingpin.
半掛車前向距離從後軸基準線量到牽引銷中心。
閱讀相關知識
It is not measured from the front or back of the body to an axle. Full trailers and rigid vehicles use different forward-distance definitions.
它不是從車體最前端或最末端量到車軸；全掛車與剛性車輛的前向距離各有不同量法。