This paper is a product of CCAP"s Mitigation Action Implementation Network (MAIN). It presents analysis of barriers and critical enablers of Colombia"s Bus Rapid Tranist (BRT) systems. Many major cities in Colombia struggle with managing transportation issues arising from growing populations and vehicle use and the development of sustainable public transportation alternatives. Rapidly developing metropolises suffer from highly congested roadways, extreme air pollution and high rates of road-related accidents. In Colombia, these issues stem partly from the over-saturation of independent bus operators, underinvestment in infrastructure and inefficient operations. In 2002, Colombia championed the National Urban Transport Program (NUTP) that revolutionized the public transport system, implementing Strategic Public Transportation Systems (SPTS) and expanding BRT systems in major cities.