Future Expansion of Copenhagen Metro

Cityringen (the City Circle Line) in Copenhagen

Two more metro lines have already been approved by the Danish Parliament on 1 June 2007. M3 and M4 will together serve the Cityringen (The City Circle Line). Its main purpose is to connect the individual parts of central Copenhagen and cover the places with insufficient or no service by S-train or metro at this time. It should relieve the busy S-train and metro sections around Nørreport of some traffic and substitute a big portion of bus lines in the heart of Copenhagen.
M3 will be a circle line covering the whole Cityringen, while M4 will service only the eastern part of the circle with more dense traffic.

The expansion plan of Copenhagen metro

The construction of Cityringen is scheduled to start in 2009 and should finish in 2018. Estimated cost is 15 billion DKK. The design of stations and the driverless trains should not be much different from the currently operating lines.
Besides M3 and M4, there are at least three additional lines being discussed as further expansion of Copenhagen metro, but no official decision has been made yet.

Planned route of new metro lines in Copenhagen

Both M3 and M4 will run from København H (Main Train Station) over Rådhuspladsen and Christiansborg to the existing metro station at Kongens Nytorv, where they will cross M1 and M2. Then the new metro will go over Frederiks Kirke (Marmorkirke) to intersect the S-train and DSB network at Østerport. From Østerport the new metro will head to Nørrebro with planned stations at Trianglen, Poul Henningens Plads, Vibenshus Runddel, and finally the S-train station Nørrebro, where M4 service will end.
M3 will continue to the western part of the circle through Nørrebros Runddel, Landsarkivet, and Aksel Møllers Have, it will cross the M1 and M2 again at Frederiksberg, and then continue through Platanvej and Enghave Plads back to København H.