Bypasses
- Palmerstown – 1987
- Lucan – 1988
- Chapelizod - 1990
- Leixlip, Maynooth, Kilcock – 1994
- Mullingar – 1994
- Longford – June 1995
- Drumsna, Jamestown – 1997
- Collooney, Ballisodare – January 1998
- Boyle, Ballinafad – 1998-1999
- Sligo (Partially) – September 2005
- Enfield, Kinnegad – December 2005
- Edgeworthstown – June 2006
- Dromod, Roosky – December 2007
Read more about this topic: N4 Road (Ireland)