Placed vertically or at the level, the kerbs demarcate pavement areas. Placed at a superior level from the finished surface, they are used to contain the excess of surrounding ground in the presence of flowerbeds and inclined surfaces. With certain proceedings, they are necessary for the jointure of steps and surfaces put at different levels. The kerb, moreover, can be produced with different radii of curvature or with cuts (gulley) for the water removal.