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Design of road From Wikipedia, the free encyclopedia
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.
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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 such roads do not require the physical standard of motorways to be designated as expressways. 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.
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.
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