2+2 road

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

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

These roads do not have hard shoulders and therefore cannot be designated as motorways in the future. However, they may be designated as limited-access roads as expressways do not require the physical standard to be designated. The Irish variant 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.

First Irish 2+2

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

References
  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)
  7. Ireland's First 2+2 Road Type Opens in Dromod Roosky Archived 2009-07-26 at the Wayback Machine
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