Having crossed the Grand Canal the route divided again for a portion of Leeson Street Upper, with outbound traffic proceeding via Sussex Road.

Eventually converting from single carriageway (including bus lanes either side) to dual carriageway at Donnybrook Church, which marks the beginning of what is known as the Stillorgan Road.The Stillorgan Road brought the road past Belfield, where University College Dublin is located (and accessed from a grade-separated interchange on the dual carriageway - the first full interchange built in Ireland) and onwards to its junction with Mount Merrion Avenue.

Heading south, the N11 currently starts in Mount Merrion at the junction with the N31 to Dún Laoghaire harbour.

Dublin Bus Route 46A operates over this stretch of road as far as the junction with Kill Lane in Foxrock.

The 145 links Bray to various parts of the city centre as far as Heuston Train Station Along the Shankill Bypass, the M11 is joined by the Dublin's M50 motorway partial ring road, which terminates at a major junction along the M11, which opened in June 2005.

This link allows motorists to drive on continuous motorway and dual carriageway from Oilgate, County Wexford to various destinations via the M50 and the national roads it serves.

West of Bray in County Wicklow, the motorway ends, with the N11 continuing south as dual carriageway through the Glen of the Downs.

The upgrading of the road to dual carriageway through the Glen of the Downs was controversial, as the valley is a wooded area.

A campaign of protests, mainly by environmental activists, led to long delays in the construction of this section of road, but the work was eventually completed with a minimal disruption to the woodland.

The N11 has been gradually upgraded from single to dual carriageway standard from the 1950s to the present, with improvements taking place at an accelerated pace in recent years.