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Within standard dimensions, how far may an ordinary non-agricultural heavy trailer and its load extend on either side of its longitudinal centre line?
标准尺寸下，普通非农用重型挂车连同货物，从纵向中心线向任意一侧最多延伸多远？
An ordinary non-agricultural heavy trailer and its load may extend up to 1.275 metres on either side of the longitudinal centre line under standard dimensions.
标准尺寸普通重型挂车连同货物，从纵向中心线向任意一侧最多1.275米。
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The usual overall width limit of 2.55 metres also applies. Agricultural and overdimension exceptions are outside this question. Marking a wide load does not remove dimension limits.
总宽通常也不得超过2.55米。农业车辆或超尺寸等特别条件不在本题范围内；标识超宽货物不等于免除尺寸要求。