The new €120m N2 Dublin/Derry bypass at Castleblayney opened on the 5th  November 2007.

The Castleblayney to Clontibret by-pass project is the largest road realignment undertaken by Monaghan Council it consists of a 16kms of carriageway providing a by-pass for the traffic on the N2 National Primary route to Castleblayney and the villages of Annyalla and Clontibret.

A point of note also is that the Castleblayney by-pass project was the second of four pilot projects which involved what is known as “the 2 plus 1 road system”.

The 2 plus 1 road type consists of two lanes in one direction of travel and one in the opposite direction. The two-lane section, which provides a safe overtaking zone, alternates with one-lane section at intervals of 2k approximately. It is separated by a crash barrier thereby drastically reducing the number of head-on collisions with the potential of halving the death toll on these two-lane roads.

The 2 plus 1 road system also operates in Sweden, Denmark, Finland and Germany.