Later when overpopulation turned Brasilia into a dystopia, the transportation system also played an important role in mediating the relationship between the Pilot plan and the satellite cities. Because of overpopulation, the monument axis now has to have traffic lights on it, which violates the concept of modernity and advancement the architect first employed. Additionally, the metro system in Brasilia was mainly built for inhabitants of satellite cities. Though the overpopulation has made Brasilia no longer a pure utopia with incomparable modernity, the later development of traffic lights, buses routes to satellite cities, and the metro system all served as a remedy to the dystopia, enabling the citizens to enjoy the kind of modernity that was not carefully planned.