The Atlantic corridor or Atlantic motorway  is a road project in Ireland that eventually will link Waterford in the South-East to Letterkenny/Derry in the North-West via motorway or dual carriageway. A major infrastructure project, the scheme was announced as part of the Transport 21 project launch in 2005, and was originally due to be completed by 2015. Due to the Great Recession, however, major sections of the roadway were delayed or cancelled, with no construction current as of 2017.
The Atlantic Corridor, when combined with the inter-urban motorways linking Dublin and the other cities, will effectively ring the island of Ireland, while at the same time connecting the primary population and economic centres.
National primary roads
The constituent routes are:
- N15 linking Letterkenny and Sligo
- N17 linking Sligo and Galway
- N18 linking Galway, Ennis and Limerick (including the Limerick Tunnel project)
- N20 linking Limerick and Cork
- N25 linking Cork and Waterford
Following the motorway re-designations of 28 August 2009, 27.8 km of the route is now motorway.
- N4 Colloney to Sligo
- N6 Bóthar na dTreabh, Galway
- N15 Ballyshannon/Bundoran bypass
- N17 Tuam bypass
- M17/M18 Tuam to Gort
- N18 Limerick western bypass and tunnel
- N18 Limerick to Shannon
- M18 Crusheen to Gort
- M18 Shannon to Ennis
- M18 Ennis Bypass
- M20 Limerick to Patrickswell
- N20 Blarney to Cork
- N25 Waterford City Bypass
- N25 Cork to Midleton
- N25 Carrigtwohill to Midleton road - construction rescheduled
- M20 Patrickswell to Blarney - planning stage
- N25 Midleton to Youghal - suspended
- N40 Cork North Ring Road east
- Atlantic Corridor Archived 2008-12-16 at the Wayback Machine.
- No toilet stop provided on 101km ‘Atlantic motorway'
- Brian McDonald. "Atlantic Corridor roads plan starts three years early", Irish Independent, 26 January 2007.
- Eoin English €1bn Cork-Limerick motorway plan a step closer Irish Examiner, 25 February 2010