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1·Road studs delineate the edges of a carriageway or the division of traffic lanes.

行车道上镶嵌反光路钉，用以划分行车道的边缘或行车。

2·Green studs indicate the edge of any part of the carriageway at a road junction, layby or passing place.

绿色路钉则设于毗连让车处及小路的入口车路边缘。