Between 2000 and 2007, car use doubled in the Valley of Mexico, the region that includes Mexico City and the surrounding metropolitan area. In 2007, 33 percent of residents said they used cars as a means of transport, compared with 17 percent in 2000, according to a recent study by the National Institute of Statistics, Geography and Informatics, known as INEGI. Some 19 percent of cars driven nationwide in Mexico are used vehicles imported from the United States. These vehicles sometimes lack pollution controls that have become standard even in Mexico, contributing to excess air pollution.
Meanwhile the city is trying to improve public transportation options, and is building a second Bus Rapid Transit line, known as the Metrobús, as we've noted in the past. Currently only 74,000 people use the Metrobús daily. :: Via Excelsior