Junctions
This is the National Roads Authority's Exit numbering scheme for the M1. As of 2011 all junctions feature their number on road signs.
| Northbound exits (read up) | Junction | Southbound exits (read down) |
| Entering Northern Ireland Road continues as A1 |
— | Entering Republic of Ireland Start of N1 |
| Jonesborough Note: Sliproad crosses the border half way up | Jonesborough, Carrickcarnan (R132), Customs and Excise | |
| No exit | Ravensdale (R132) | |
| Northbound exits (read up) | Junction | Southbound exits (read down) |
| Dundalk, Ballymascanlon (N52) | Dundalk, Ballymascanlon (N52) | |
| Castleblayney, Dundalk (N53) | Castleblayney, Dundalk (N53) | |
| Dundalk, Mullingar (N52) | Dundalk, Mullingar (N52) | |
| Castlebellingham Services | Castlebellingham Services | |
| Castlebellingham, Tallanstown (R166) | Castlebellingham, Tallanstown (R166) | |
| Ardee, Derry (N33 (N2)) | Ardee, Derry (N33 (N2)) | |
| Dunleer, Dromin (R170) | No exit | |
| Dunleer, Collon (R169) | Dunleer, Collon (R169) | |
| No exit | Monasterboice (R132) | |
| Drogheda North, Navan (N51) | Drogheda North, Navan (N51) | |
| Drogheda, Donore | Drogheda, Donore | |
| Drogheda, Duleek (R152) | No exit | |
| Julianstown, Drogheda South (R132) | Julianstown, Drogheda South (R132) | |
| Balbriggan, Naul (R132) | Balbriggan, Naul (R132) | |
| Balbriggan (R132) | Lusk, Rush (R132) | |
| Lusk services | Lusk services | |
| Skerries, Rush, Donabate (R132) | Swords (North), Malahide, Donabate (R132 (R126)) | |
| Swords (Centre) (R125) | No exit | |
| Dublin Airport, Swords (South) (R132) | Dublin Airport, Swords (South) (R132) | |
| Start of M1 motorway | Malahide (N32), ALL OTHER ROUTES (M50 ) Motorway continues as M50 for Dublin and Dublin Port |
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Read more about this topic: M1 Motorway (Republic Of Ireland)