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The new curb stone adopts a double-layered upper and lower composite structure. The upper layer is ordinary concrete and the lower layer is porous concrete, so that the lower layer of the curb stone has a water seepage function. At the outer side of the curb stone, at least the inside of the porous concrete layer has a recessed notch hole extending longitudinally with the curb stone. Han, so that it has the function of diversion.