Since its implementation, TransMiIenio has grown from its initial 14 kilometers to 112 km, and from 30,000 passengers on its inaugural day, to more than two million passengers every day. Currently, it is being integrated with the rest of the city buses in the Integrated Public Transportation System (SITP). Despite its widespread success, TransMilenio still faces big challenges. Specifically, the BRT system is working to improve quality of service; boost citywide integration of public transportation services; reduce emissions and air pollution; reduce fatal traffic crashes, and advance funding.