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 where there are a number of Swedish variants 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.
First Irish 2+2
- "Irish Design Standard (pdf)". Archived from the original on 2016-03-03. Retrieved 2013-07-28.
- Swedish 2+2 Types (In Swedish)
- N4 Drumsna Longford (Dromod Roosky)[permanent dead link]
- Ireland's First 2+2 Road Type Opens in Dromod Roosky Archived 2009-07-26 at the Wayback Machine