 In addition to the major inter-urbans, the N11, N17, N18, N20, N21, and N25 – all of which form links between regional cities or other strategic links – also have major sections of good standard dual carriageway (in the N18's case, the entire route is made up of dual carriageway and motorway since 2017), with some sections of motorway also in place.Current plans are to substantially replace the existing N20 with a motorway (the M20).Based on the combined lengths of existing roads, current construction and proposed future construction, it is probable that over 50% of the national primary road network will be either motorway, high-quality dual carriageway or 2+2 dual-carriageway by 2030.