The TransMilenio Bus Rapid Transit (BRT) system in Bogota, Columbia is unique and represents one of the world’s premier BRT systems. It provides the city with an efficient and safe mass transit system that encourages high ridership. The BRT system has clearly played a major role in reducing traffic congestion throughout the city. Residents and visitors of Bogota now enjoy reduced travel time, cleaner air, and fewer accidents. There has been a 32% reduction in overall travel time; a 40% reduction in air emissions from the scrapping of more than 2,100 old public service buses; and a 92% reduction in accident rates in corridors where the TransMilenio system operates. Post-BRT Bogota has recorded significant fuel savings of 47%, while increasing throughput by 60%. The program was a success due to many factors: strong leadership from the City Mayor; careful design and planning; use of state-of-the-art technology; the establishment of a well-managed company; sound investment in infrastructure; and an efficient single-fare pricing system.