It’s an active signaling system for pedestrian safety in the tramway corridor of the center of Medellin, -GLOW- arises from the need to alert the people whom walk though it, so that they are not surprised when walking distracted through the center. This project consists of two elements, a horizontal module that fits into the existing  GLO and defines which the secure area is, and a vertical module that adapts to the module that adapts the central tramway posts to avoid creating obstacles and make it more visible. This two components work simultaneously warning when the tramway is approaching through light signals, which vary their frequency as it approaches.