M4 motorway (Ireland)

N4 road
Route information
Length:	210 km (130 mi)
Location
Primary destinations:	(bypassed routes in italics) County Dublin M50 Lucan County Kildare Leixlip Maynooth Kilcock County Meath Enfield Clonard County Westmeath M6 Kinnegad (M6 to Galway) Mullingar N52 Ballinalack Rathowen County Longford Edgeworthstown N63 Longford Town (N5 to Westport) Ireland Newtownforbes County Leitrim Roosky Dromod Aghamore Mohill Drumsna Jamestown Carrick-on-Shannon R280 County Roscommon Cootehall Boyle N61 County Sligo Ballinafad Castlebaldwin Riverstown N17 Collooney N59 Ballysadare Sligo town N16
Road network
Roads in Ireland Motorways Primary Secondary Regional

M4 motorway
Route information
Part of
Length:	62 km (39 mi)
Existed:	1994 – present
History:	Completed 1994–2005
Major junctions
From:	Lucan
To:	Kinnegad
Location
Primary destinations:	Leixlip, Kilcock, Enfield
Road network
Roads in Ireland Motorways Primary Secondary Regional

(bypassed routes in italics)

The N4 road is a national primary road in Ireland, running from Dublin to the northwest of Ireland and Sligo town. The M6 to Galway diverges from this route after Kinnegad, while the N5 to Westport diverges at Longford town. The section of the N4 that is motorway-standard is designated the M4 motorway.

The N4 originates at an intersection with the M50 motorway at Junction 7. This is also Junction 1 of the N/M4. The Liffey Valley Shopping Centre is located at junction 2. The road has three lanes and a bus lane in each direction between the M50 and start of the M4 at Leixlip.

The N4 was the only one of the main inter-urban national routes whose dual-carriageway section continued into the city centre; however, the section inside the M50 was re-classified as the R148 in 2012.

...
Wikipedia