improved curb, designed for use in urban areas and with the primary aim to establish a containment barrier preventing access of vehicles to the sidewalk, characterized in that is constituted by a generally prismatic body, whose upper base a sharp stepping defined defining a difference in height between the corresponding to the road area and corresponding to the curb sufficient level as an area for which, when exceeding the vehicle wheel the upper area of the gradation and accessing the lower, chassis incise on that leaving the locked vehicle.
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