Similarly to Berlin but unlike Hanover, the S-Bahn is an important part of public transport within the city due to its dense schedule and good coverage of the metropolitan region. Unlike both Berlin and Hanover, the S-Bahn is of little importance for regional traffic since the network lies mostly within the city, though in 2007 the southwestern S3 line was extended about 32 km (20 miles) into the state of Lower Saxony (the "Neugraben - Stade" portion, which included seven new stations).