2+2 road

A 2+2 road is a specific type of dual-carriageway that exists primarily in Ireland,[1] Sweden,[2] Estonia and Finland,[3] consisting of two lanes in each direction separated by a steel cable barrier.

These roads do not have hard shoulders and therefore cannot be designated as motorways in the future.

Junctions are generally at-grade roundabouts and minor roads cross under or over the mainline without connecting.

They are also known as "type 2 dual-carriageways" by the Irish National Roads Authority.

In Ireland first purpose-built road of this type opened in December 2007[6][7] as a new greenfield section of the N4 national primary route which joins Dublin to Sligo.