A majority of residents in Buenos Aires and its suburbs use public transportation. A Buenos Aires invention is the "colectivo", a small bus built out of a truck chassis and seating 21 to 27. Numerous colectivos and larger public buses traverse the city each hour providing access to virtually all neighbourhoods.
The Buenos Aires Metro (locally known as el subte, from "subterráneo" meaning "underground") is an extensive system providing access to various parts of the city. Opened in 1913, it is the oldest subway system in the Southern Hemisphere and in the Spanish-speaking world.
European and modern styles in Buenos AiresBuenos Aires used to be relatively congestion-free for a city of its size. Toll freeways opened in the late 1970s by then-mayor Osvaldo Cacciatore provided fast access to the downtown area, increasing the number of cars coming into the city. During Cacciatore's tenure, the streets of the downtown financial district (roughly one square kilometre in size) were declared off-limits to private cars during daytime. Main avenues of the city include the 140-m-wide 9 de Julio Avenue, the over-35-km-long Rivadavia Avenue, and the cultural-centred Corrientes Avenue.
Following the economic mini-boom of the 1990s, more people started commuting by car, and congestion increased. Most major avenues are gridlocked at peak hours. Another source of congestion is the flight of many people to the country on weekends.
Black-and-yellow taxis roam the streets at all hours. Some of these are unlicensed (controls are not fully enforced), so visitors are advised to phone a reputable radio-link company. Low-fare limo services, known as remises, have become more popular in recent years.
All of Argentina's extensive railway network converges on Buenos Aires. The three principal stations for both long-distance passenger services and commuter trains are Estación Retiro, Estación Constitución, and Estación Once.
The Buenos Aires international airport, Ministro Pistarini International Airport, is located in the suburb of Ezeiza and is often called simply "Ezeiza". The Aeroparque Jorge Newbery airport, within city limits near the river, serves mostly domestic traffic.