The Minister for Transport will officially open a section of the N5 Ballaghaderreen to Scramogue bypass next Thursday.
Minister Darragh O'Brien will cut the ribbon on the 7-kilometre stretch from Ballinagare to Tibohine.
It's part of the wider 34-kilometre project which will also bypass Ballinagare, Tulsk and Strokestown.
The newly opened section will see Frenchpark and Sheepwalk bypassed.
Cathaoirleach of Roscommon County Council Liam Callaghan has welcomed the news: