The road leaves Dublin south of Clondalkin, where it is called the "Naas Road" (the Luas tram system runs along the median of the dual carriageway). The N7 intersects the M50 motorway at the "Red Cow Roundabout", often termed the "Mad Cow Roundabout" due to traffic problems. This section of the N7 is to be upgraded to three lanes of dual-carriageway, with work having commenced on the 4 January2005. The Mad Cow Roundabout is also to be replaced with a near-freeflow interchange, as part of a ?1.1 billion project to upgrade the M50.
Outside Dublin, five consecutive bypass projects, around Naas, Newbridge, Kildare, Monasterevin and Portlaoise, have replaced the single carriageway road with motorway. The N7 road originally passed through the town centres of these places. This route section is designated M7 motorway, and is continuous from the outskirts of Dublin to south of Portlaoise, following the opening of the Monasterevin bypass in late 2004.
Past Portlaoise, the route runs around the outskirts of Roscrea, and completely bypasses Nenagh. After meeting Limerick's southern ring road, the N7 bypasses Annacotty and enters Limerick through Castletroy.
The M50 motorway is a motorway and National Primary Route (N50) in the Republic of Ireland running in a C-shaped ring around the north-eastern, northern, western and southern sides of the capital city, Dublin.
Work commenced in early 2006 on upgrading the earlier sections of motorway, with the current grade-separated signal-controlled roundabout interchanges to be replaced with free-flowing "spaghetti junctions", and much of the road to be widened to three lanes in each direction.
The South Eastern Motorway section, a radial route, was oringinally meant to be part of the M11.
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