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A trailer load extending more than what distance behind the body requires projecting-load warning flags or lights, as appropriate?
掛車貨物超出車身後方超過多少距離時，須按適用規定設置突出貨物警示旗幟或燈光？
A load projecting more than 1 metre behind the trailer body requires the applicable projecting-load warnings.
貨物向掛車車身後方伸出超過1米時，須按規定設置突出貨物警示標識或燈光。
閱讀相關知識
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米是觸發閾值；日間用合規旗幟或標識，夜間用相應燈光。還須滿足後懸、總長和其他適用限制，不能僅加標識便任意伸長。