2+2 road

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An example of a 2+2 =20 dual-carriageway in Ireland (the N4)

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

These roads do not have hard shoulders and therefore they cannot be designated as Motorway at some future date. However, they may be designated as limited-access roads in the future as exspressways do not require the physical standard to be designated. The Irish variant, however, has 3.5-metre-wide (11 ft) lanes[4] where there are a number of Swedish variants[5] some with 3.25-metre-wide (10.7 ft) lanes.

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. These roads look similar to expressways, except that expressways often have interchanges, large medians or concrete barriers between traffic. The United States has 80,000 kilometres (50,000 mi) of roads that fit this description[citation needed].

First Irish 2+2[edit]

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.

See also[edit]


  1. ^ http://goo.gl/maps/8nI5Y
  2. ^ http://goo.gl/maps/Vfylm
  3. ^ http://goo.gl/maps/kO9aX
  4. ^ "Irish Design Standard (pdf)". Archived from the original on 2016-03-03. Retrieved 2013-07-28.
  5. ^ Swedish 2+2 Types (In Swedish)
  6. ^ N4 Drumsna Longford (Dromod Roosky)[permanent dead link]
  7. ^ Ireland's First 2+2 Road Type Opens in Dromod Roosky Archived 2009-07-26 at the Wayback Machine