Denmark Region, which encompasses the Copenhagen metropolitan area with the exception of the subtracted province East Zealand but includes the Baltic Sea island of Bornholm, has a population three times larger than that of North Denmark Region, which covers the more sparsely populated area of northern Jutland. Under the county system certain densely populated municipalities, such as Copenhagen Municipality and Frederiksberg, had been given a status equivalent to that of counties, making them first-level administrative divisions. These "sui generis" municipalities were incorporated into the new regions under the 2007 reforms. The Kingdom of Denmark is a unitary state that comprises, in
Denmark electrified suburban railway network, the S-train. In the four largest cities – Copenhagen, Aarhus, Odense, Aalborg – light rail systems are planned to be in operation around 2020. Cycling in Denmark is a very common form of transport, particularly for the young and for city dwellers. With a network of bicycle routes extending more than 12,000 km and an estimated 7,000 km of segregated dedicated bicycle paths and lanes, Denmark has a solid bicycle infrastructure. Private vehicles are increasingly used as a means of transport. Because of the high registration tax (150%), VAT (25%), and one of the world's highest