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What is the maximum forward distance for a heavy rigid vehicle without a tow coupling?
没有牵引连接装置的重型刚性车辆，最大前向距离是多少？
A standard heavy rigid vehicle without a tow coupling has a maximum forward distance of 9.5 metres.
没有牵引连接装置的标准重型刚性车辆，最大前向距离为9.5米。
阅读相关知识
The usual limit with a tow coupling is 8.5 metres. Neither figure is the vehicle's overall length.
有牵引连接装置时通常是8.5米；不要把两者或车辆总长混为同一个数值。