A regional road in Ireland is a type of road which does not form a major route (such as a national primary road or national secondary road) but nevertheless, does provide a link in the national route network. Regional roads are numbered with three-digit route numbers, prefixed by "R" eg R154 which runs for 57 miles and links the R147 near Clonee, County Meath with the R198 at Crossdoney (near Cavan) in County Cavan. The road is single carriageway throughout
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