R639
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The R639 road is one of Ireland's regional roads. Once designated the N8 national primary road (and before that some fractions were designated as the T6 and others as the T9), it was reclassified in stages as the R639 following the progressive opening of sections of the M8 motorway, which rendered the single carriageway N8 redundant as a national primary road. By-passed sections of the old N8 were generally reclassified as R639 as soon a new section of M8 opened, thereby increasing the length of the R639. With the completion of the M8 on 28 May 2010, the R639 now stretches from Durrow, County Laois to Cork, running through counties Laois, Kilkenny, Tipperary, Limerick and Cork.
The R639 runs parallel to the M8 from its junction with the N77 in Durrow in County Laois to the N8 on the Lower Glanmire Road 1.5 km east north of the Dunkettle Interchange on the outskirts of Cork City. North to south, it passes through Durrow, Cullahill, Johnstown, Urlingford, Littleton, Horse and Jockey, Cashel, and New Inn; and from there it runs south-west around Cahir and on through Skeheenarinky before entering County Limerick and passing through the village of Kilbeheny before veering west of Mitchelstown and proceeding south along Kilworth Mountain and through Fermoy, Rathcormack, Watergrasshill, Sallybrook and Glanmire, terminating at the N8 Lower Glanmire Road.
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