Roadstone refers to the boundary stone set at the edge of the road surfacecall, name, say, weighRoad curb or curbstone is a boundary on the road surface that distinguishes between lanes, sidewalks, green spaces, median strips, and other parts of the road, serving to protect pedestrians and ensure neat edges of the road surface. The forms of curbstones include vertical, inclined, and flat. As an auxiliary material for laying road surfaces, curbstones can not only beautify the road but also protect it from damage.