The principal mode of personal transportation is the car. There are no public railways — although there are bus services. Transport from one major town to another, for example Reykjavík to Akureyri, may be by aeroplane on a domestic flight. The only ways of getting in and out of the country are by air and sea. Iceland has 12,869 kilometres (7,996 mi) of publicly administered roads, 5,040 kilometres (3,130 mi) of which are paved. Organized road building began about 1900 and has greatly expanded since 1980. Vegagerðin(Icelandic Roads Administration) is the legal owner and constructor of the roads, and oversees and maintains them as well.The only habitable islands around Iceland are supplied and infrastructurally connected with the mainland via ferries which run regularly. Reykjavík has an extensive network of local buses connecting all the suburbs, and running to Akranes, Borgarnes, Hveragerði, Selfoss and Hvalfjarðarsveit.