Toronto's main public transportation system is operated by the Toronto Transit Commission (TTC).The backbone of its public transport network is the Toronto subway system, which includes three heavy-rail rapid transit lines and a light metro line exclusively serving the eastern district of Scarborough. The TTC also operates an extensive network of buses and streetcars. There have been numerous plans to extend the subway and implement light-rail lines, but many efforts have been thwarted by budgetary concerns. Since July 2011, the only subway-related work is the Spadina subway (line 1) extension north of Downsview Station to Vaughan Metropolitan Centre. By November 2011, construction on Line 5 Eglinton began. Line 5 is scheduled to finish by 2021.In 2015, the Ontario government promised to fund the Finch West LRT (line 7) which is to be completed by 2021.
Toronto's public transit network also connects to other municipal networks such as York Region Transit, Viva, Durham Region Transit, and MiWay.
The Government of Ontario also operates a commuter rail and bus transit system called GO Transit in the Greater Toronto Area. GO Transit carries over 250,000 passengers every weekday (2013) and 57 million annually, with a majority of them travelling to or from Union Station.GO Transit is implementing RER (Regional Express Rail) into its system.
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 Billy Bishop Toronto City Airport (IATA: YTZ) on the Toronto Islands, southwest of downtown. Toronto/Buttonville Municipal Airport (IATA: YKZ) in Markham provides general aviation facilities. Toronto/Downsview Airport (IATA: YZD), near the city's north end, is owned by de Havilland Canada and serves the Bombardier Aerospace aircraft factory.
The Union Pearson Express is a train service that provides a direct link between Pearson International and Union Station. It began carrying passengers in June 2015.
The grid of major city streets was laid out by a concession road system, in which major arterial roads are 6,600 ft (2.0 km) apart (with some exceptions, particularly in Scarborough and Etobicoke, as they were originally separate townships). Major east-west arterial roads are generally parallel with the Lake Ontario shoreline, and major north-south arterial roads are roughly perpendicular to the shoreline, though slightly angled north of Eglinton Avenue. This arrangement is sometimes broken by geographical accidents, most notably the Don River ravines.
Toronto's grid north is approximately 18.5° to the west of true north.
There are a number of municipal expressways and provincial 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 the busiest road in North America,and one of the busiest highways in the world.The main municipal expressways in Toronto include the Gardiner Expressway, the Don Valley Parkway, and to some extent, Allen Road.