A metro line is to be built linking the centre of Dublin with Dublin airport at a cost to taxpayers of between 1.4 and 1.7 billion. To be completed by 2012, the Metro North line will allow a journey time of 17 minutes from St Stephens Green to the airport, and should take around 40,000 cars off the city streets. Running for 17 km, half underground and half overground, the line will have stops at St Stephens Green, O'Connell Bridge, Parnell Square (possible), Santry Demesne, Metropark, Dublin Airport, Nevinstown, Swords, Seatown and Lissenhall, where a park-and-ride facility for 2,000 cars will be built. The new metro will not operate between midnight and 05.00, when servicing and maintenance work will be carried out.