Transport

By Air
• Oslo Airport (Gardermoen, Akershus)
Norway's main international airport - served by high-speed train (Flytoget)
• Sandefjord Airport (Torp, Vestfold)
• Moss Airport (Rygge, Østfold)

By Sea
There are daily ferry connections to Kiel (Germany), Copenhagen (Denmark), Frederikshavn (Denmark) and Nesodden.
Public ferries run daily to and from the islands scattered in the Oslo harbour basin.

By Train
Oslo Sentralstasjon is the main railway station in Oslo. From there, there are connections to far away destinations Trondheim, Bergen, Stavanger, Stockholm (Sweden), Gothenburg (Sweden) and Copenhagen (Denmark), as well as several local and regional destinations in southern Norway and Sweden. In 2004 Norwegian Trains were Europe's third most punctual national train company. For the first 4 months in 2005 the punctuality was 92.9%. During winter in particular, weather conditions such as snow and blizzards may cause delays and cancellations on the routes crossing the central mountains.

Public Transport
The public transportation system in Oslo is managed by the municipal transport company Ruter. This includes metro, tram, bus and ferry, but not the local train lines, which are operated by the state railway company NSB. All public transport in Oslo, including local trains, operates on a common ticket system, allowing free transfer within a period of one hour with a regular ticket. Tickets also transfer to the local and inter-city trains, unless a traveler intends to cross the city border. In 2004, 160 million journeys were made using public transport, of which 85% was handled by Oslo Sporveier's own subsidiaries and 15% by private bus and ferry operators under cost-based contracts.
Oslo' Tram is its efficient form of rapid transit.

The tram system, Oslotrikken, is made up of six lines that criss-cross the inner parts of the city and extend outward toward the suburbs. Trams run partly on in the streets and partly on separate roads. The metro system—known as the T-bane -- connects the eastern and western suburbs and comprises six lines which all converge in a tunnel beneath downtown Oslo. The metro lines are identified by numbers from 1 to 6, with two lines running into the municipality of Bærum in the west. The tramway lines are numbered 11 to 13 and 17 to 19.

A new, partially underground loop line was opened in August 2006, connecting UllevΓ¥l in the northwest and Carl Berners plass in the east. Two new stations, Nydalen and Storo, have been operational for a couple of years already; the third station, Sinsen, opened 20 August 2006, completing the loop. In conjunction with the opening of the circle line, there will be a major upgrade of the rolling stock, with delivery taking place between 2007 and 2010. An RFID ticketing system with automatic turnstile barriers has been under introduction for several years, but has been greatly delayed. The transition to the new system is now underway, with the new RFID cards available to the public.

A public bicycle rental programme has been in operation beginning in April every year since 2002. With an electronic subscription card, users can access bikes from over 90 stations across the city.

Road
As Oslo is Norway's capital and biggest city, several national highways meet or passes through it. European route E6 runs through Oslo in the eastern suburbs on its way from Southern Sweden to Northern Norway. European route E18 runs through downtown Oslo (including a tunnel under Akershus festning) on its way from Stavanger and Kristiansand to Stockholm. European route E16 from Bergen doesn't go into Oslo proper, but ends on E18 at Sandvika a few kilometers west of Oslo. Oslo also has a system of "ring roads" connecting east and west. Ring 3, the outer one, runs from the E6 junction in the east via Ullevål to E18 on the border to Bærum municipality in the west. Ring 2 runs from Gamlebyen in the east to E18 at Skøyen in the west. Ring 1 is the downtown "through road". The ring roads make navigation easier and improve trafic flow. E18, E6, Ring 2 and Ring 3 are connected by an elaborate system of tunnels and bridges in the Økern-Ekeberg area. At present (2008) a new underwater tunnel for E18 is under construction in Bjørvika to divert traffic from the street level.

Source: wikipedia.org