The first species is a border used in the construction of roads. He plays the role of stopping and limiter. High -quality border, which laid out the most significant sections of roads, such as intersections, turns, is able to not only prevent the explosion of the canvas, but also prevent the car away outside the road. In addition, the borders of this species are bordered by sidewalks, which also need support from blurring. In fact, the curb plays the role of a box that prevents the appearance of gaps and cracks.