M1 motorway (Republic of Ireland)
motorway in Ireland connecting Dublin and the Northern Ireland border towards Belfast
The M1 motorway (Irish: Mótarbhealach M1) is a motorway in Ireland. It forms the large majority of the N1 national primary road connecting Dublin towards Belfast along the east of the island of Ireland. The route heads north via Swords, Drogheda and Dundalk to the Northern Irish border just south of Newry in County Armagh, where it joins the A1 road and further on, the M1 motorway in Northern Ireland. It also forms a significant part of the road connection between Dublin and the Northern Irish cities of Newry, and Lisburn.
The route is part of European route E01.
Route
Almost the entire length of the N1 has been upgraded to motorway standard and is designated the M1 motorway. It runs from the Junction 3 of the M50 ring road in Dublin, past Cloghran, Swords, Balbriggan, Stamullen, Drogheda, Dunleer, Castlebellingham and Dundalk before ending at Ballymascanlon north of Dundalk. It by-passes many towns and villages through which the N1 travelled. The original N1 route now forms the R132. At Ballymascanlon, it becomes the N1 dual carriageway and continues to the border with Northern Ireland.
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The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Sep 18, 2026. The linked authority identifier is Q496830. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank.
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This entry incorporates text from “M1 motorway (Republic of Ireland)” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.