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What is the maximum permitted forward distance of a semi-trailer?
半掛車允許的最大前向距離（forward distance）是多少？
The maximum forward distance of a semi-trailer is 9.2 metres, measured from its rear axis to the centre of the kingpin.
半掛車的前向距離是從半掛車後軸基準線（rear axis）到牽引銷中心（centre of the kingpin）的距離，最大為 9.2 米。
閱讀相關知識
Do not measure from the towing vehicle's rear axle to the front of the semi-trailer. The semi-trailer's own rear axis and kingpin define this measurement.
對半掛車而言，前向距離（forward distance）的測量基準是半掛車的後軸基準線與牽引銷中心，最大為 9.2 米。不能把它理解為牽引車後軸到半掛車前端的距離。