Norway's most extensive public transport system, managed by Ruter. This includes the six-line Oslo Metro, the world's most extensive metro per resident, the six-line Oslo Tramway and the eight-line Oslo Commuter Rail. The tramway operates within the areas close to the city center, while the metro, which runs underground through the city center, operates to suburbs further away; this includes two lines which operate to Bĉrum, and the Ring Line which loops to areas north of the center
Oslo Central Station acts as the central hub, and offers train services to most mayor cities in southern Norway as well as Stockholm and Gothenburg in Sweden. The Airport Express Train operates along the high-speed Gardermoen Line. The Drammen Line runs under the city center in the Oslo Tunnel. Some of the city islands and the neighboring municipality of Nesodden are connected by ferry. Daily cruiseferry services operate to Copenhagen and Frederikshavn in Denmark, and to Kiel in Germany.
Many of the motorways pass through the downtown and other parts of the city in tunnels. The construction of the roads is partially payed through a toll ring. The major motorways through Oslo are European Route E6 and E18. There are three beltways, the innermost which are streets and the outermost, Ring 3 which is a motorway.
The main airport serving Oslo is Oslo Airport, Gardermoen, located in Ullensaker, 47 kilometres (29 mi) from the city center of Oslo. It acts as the main international gateway to Norway, and is the sixth-largest domestic airport in Europe. Gardermoen is a hub for Scandinavian Airlines, Norwegian Air Shuttle and Widerĝe. Oslo is also served by two secondary airports, which serve some low-cost carriers, such as Ryanair: Moss Airport, Rygge and Sandefjord Airport, Torp, the latter being 110 kilometres (68 mi) from the city.