One of the most important interventions in the city for this time was its transportation system. In 1967, there were 2,679 urban buses in Bogotá that transported, on average, 1,629,254 passengers per day. The city had a little more than a million inhabitants and 8,000 hectares in length, the service was relatively reasonable and comfortable. But as the city grew and reached more than five million inhabitants and an area greater than 30,000 hectares, not only did the car fleet increase substantially to reach more than 20,000 vehicles, but chaos multiplied, as well as pollution and the inefficiency of the only existing transportation system.