The plan includes continuing investment in Ireland's road network, along with investment in public transport in the form of buses and rail. A significant portion of this investment will focus on the creation of an integrated rail network in Dublin. Projects include a tunnel under Dublin city centre connecting Heuston Station with Pearse Station and Docklands station at Spencer Dock. This will facilitate the expansion of the Dublin Area Rapid Transit (DART) system from one line to two. Also included are several new Luas lines, a metro system, and tighter integration between all rail systems, particularly at the planned St. Stephen's Green interchange. This will create a single integrated rail network in Dublin that serves the north, south, east and west of the city.