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A trailer load extending more than what distance behind the body requires projecting-load warning flags or lights, as appropriate?
挂车货物超出车身后方超过多少距离时，须按适用规定设置突出货物警示旗帜或灯光？
A load projecting more than 1 metre behind the trailer body requires the applicable projecting-load warnings.
货物向挂车车身后方伸出超过1米时，须按规定设置突出货物警示标识或灯光。
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Use compliant flags or markers by day and the required lamps at night. Rear overhang, overall length and other limits still apply; warning devices do not permit unlimited projection.
1米是触发阈值；日间用合规旗帜或标识，夜间用相应灯光。还须满足后悬、总长和其他适用限制，不能仅加标识便任意伸长。