The official description of the R125 from the Roads Act 1993 (Classification of Regional Roads) Order 2012[1] reads:
R125: Swords, County Dublin - Dunshaughlin County Meath - Kilcock, County Kildare
Between its junction with M1 at Drinan and its junction with R132 at Miltonsfield via Crowscastle all in the county of Fingal
and
between its junction with R132 at Newtown in the county of Fingal and its junction with R147 at Main Street in the town of Dunshauglin in the county of Meath via Balheary Road, Watery Lane and Rathbeale Road in the town of Swords; Rathbeal, Roganstown, Tonlagee, Lispopple Cross, Killossery and Newbarn in the county of Fingal: Dun Bridge at the boundary between the county of Fingal and the county of Meath: Greenoge, Baltrasna, Ratoath and Grangend Common in the county of Meath
and
between its junction with R147 at Cooksland and its junction with R154 at Merrywell via Readsland, Knocks and Kilcooly all in the county of Meath
and
between its junction with R154 at Augherskea in the county of Meath and its junction with R148 at The Square in the town of Kilcock in the county of Kildare via Mullagh and Calgath in the county of Meath: and County Meath Bridge at the boundary between the county of Meath and the county of Kildare
and
between its junction with R148 at Harbour Street in the town of Kilcock and its junction with R407 at Duncreevan in the county of Kildare via Canal Bridge and Molly Ware Street at Kilcock in the county of Kildare.
