1. warning device for drivers of the existence of pedestrian crosswalks, that being intended to warn drivers of vehicles of the existence or nonexistence of pedestrians crossing a zebra crossing, characterized in that it is constituted by four posts, two them anchored on a sidewalk and the other two on the opposite side anchored in correspondence with the corners of the rectangular area that delimits the corresponding step zebra; with the particularity that each post includes two light sources and a pair of equipment photocells, including establishing for each pair of poles, an invisible to toggle beam through the crossing of a pedestrian by the invisible beam , the corresponding light sources of the different poles. 2. warning device for drivers of the existence of pedestrian crosswalks, according to claim 1, wherein both light sources as the two teams photocells decade post are located in correspondence with a region near the upper end thereof. 3. warning device for drivers of the existence of pedestrian crosswalks, according to previous claims, characterized in that the two light sources of each pole are located in correspondence with the face of the post facing the zebra crossing, and face confrontation the direction of movement of vehicles. 4. warning device for drivers of the existence of pedestrian crosswalks, according to claims 1 and 2, characterized in that the two teams photocells of each pole are located on the face confronting the pole situated on the same side . 5. Device for warning drivers of the existence of pedestrian crosswalks, according to previous claims, characterized in that the height of the posts is approximately the height of the vision of drivers of vehicles.
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