Don Luis is a tridimensional traffic signal that binds to a yellow bidimensional line painted on the sidewalk to avoid the pedestrian cross the street at a different place to zebra and is located only at the points of greatest vulnerability. It is different to others due to their development from a sociocultural analysis and not merely from aesthetic guidelines. In other words, it seeks to transfer the good behavior and the idea of security implemented by the Medellin Metro to the streets.