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Within standard dimensions, what is the maximum forward distance for a heavy rigid vehicle fitted with a tow coupling?
標準尺寸下，裝有牽引連接裝置的重型剛性車輛，最大前向距離是多少？
A standard heavy rigid vehicle fitted with a tow coupling has a maximum forward distance of 8.5 metres.
裝有牽引連接裝置的標準重型剛性車輛，最大前向距離為8.5米。
閱讀相關知識
The usual limit without a tow coupling is 9.5 metres. This is not the measurement or limit for a semi-trailer or every heavy vehicle.
無牽引連接裝置的重型剛性車輛通常為9.5米；本題不是半掛車或任意重型車輛的共同量法。