Public transport services operate in a systemic manner and so does everything that moves in the city. Interventions in one of the modes people use to move around affect inevitably the rest. Today, when a new Public Transport Integrated System as Transantiago is operating, whatever its problems, it makes no longer sense to keep making investments in isolated transport projects. It is time to rationalize such investments from a systemic point of view, evaluating them likewise. Large urban transport projects should no longer be the emblematic idea of some individual Government authority. Instead they should be evaluated and decided upon from the standpoint of a systemic and organized vision of the territory, urban development and mobility, thus better establishing a social optimum of public and private investments. In this way the real common interest of the city dwellers would be better served.