At present it is considered that the curb is a building element, which is obligatory for paving a sidewalk or a road, both in functional and aesthetic terms. The edges of roads, which are not limited by curbs, are being destroyed much faster. Water, draining under the road surface, quickly blurs its base, and this spoils the entire road surface. And, of course, it is more pleasant to walk on a carefully framed sidewalk than on a path with blurred edges and torn tiles.
The curb is necessary to separate the road from the lawn, mark the bike path or change the sidewalk level relatively to the green zone. It also serves as the base for the road surface, and when decorating the flowerbeds it does not allow the plants to destroy the road surface
Technical datafor “curb/garden border”