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Within standard dimensions, what is the maximum overall length of an ordinary heavy rigid truck and its load when not towing? Exclude buses and overdimension operations.
不包括巴士和超尺寸运输，未拖挂的普通重型刚性卡车连同货物，标准总长上限是多少？
The standard maximum overall length of the ordinary heavy rigid truck described, including its load, is 12.6 metres.
题中未拖挂的标准重型刚性卡车，连同货物总长上限为12.6米。
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The question excludes buses and overdimension operations. Forward overhang, rear overhang and forward distance must also comply.
本题不包括另有规定的巴士或超尺寸运输。总长合规仍须满足前悬、后悬和前向距离等各项限制。