The main entrance of the Beaux-Arts style Union Station built 1927
- Main article: Transportation in Toronto
The Toronto Transit Commission (TTC) is the third largest public transit system in North America after the New York City Transit Authority, and the Mexico City Metro. The TTC provides public transit within the City of Toronto. The backbone of its public transport network is the subway system. The TTC also operates an extensive network of buses and streetcars.
The Government of Ontario also operates an extensive rail and bus transit system called GO Transit in the City of Toronto, as well in its suburbs. With thirty-eight trains, and seven train lines, GO Transit run 179 trips, and carry over 160,000 passengers in the Greater Toronto Area every day. An additional 288 GO buses feed the main rail lines.
Canada's busiest airport, Toronto Pearson International Airport (IATA: YYZ), straddles the city's western boundary with the suburban city of Mississauga. Limited commercial and passenger service is also offered from the Toronto City Centre Airport, on the Toronto Islands. Toronto/Buttonville Municipal Airport in Markham provides general aviation facilities. Toronto/Downsview Airport, near the city's north end, is owned by de Havilland Canada and serves the Bombardier Aerospace aircraft factory.
There are a number of expressways and highways that serve Toronto and the Greater Toronto Area. In particular, Highway 401 bisects the city from west to east, bypassing the downtown core. It is one of the busiest highways in the world. The square grid of major city streets was laid out by the concession road system.