On either side of the heap is construction road, 3 meters and 4.5 meters wide respectively.
土堆两侧已开辟施工道路, 两侧道路宽分别为3米和4.5米.
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Mainly used in places such as crossings, engineering construction, road maintenance and intersections.
主要用于道路路口 、 工程施工 、 道路维修、叉道口等场所.
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