The government legislation that defines the R324, the Roads Act 1993 (Classification of Regional Roads) Order 2012 (Statutory Instrument 54 of 2012), provides the following official description:
R324: Balla — Kiltimagh, County Mayo
Between its junction with N60 at Moat and its junction with R320 at Derryvohy via Craggagh and Ballinamore all in the county of Mayo.[1]