The official description of the R127 from the Roads Act 1993 (Classification of Regional Roads) Order 2012[1] reads:
R127: Blake's Cross - Skerries - Balbriggan, County Dublin
Between its junction with R132 at Blakes Cross and its junction with R132 at Dublin Street Balbriggan via Coldwinters, Bridetree; Rathmore Road at Lusk; Balcunnin; Dublin Road, Thomas Hand Street and Balbriggan Street in the town of Skerries; Barnageeragh: Lawless Terrace, Gibbons Terrace and Market Green in the town of Balbriggan all in the county of Fingal.