The official description of the R106 from the Roads Act 1993 (Classification of Regional Roads) Order 2012 reads:
R106: Sutton - Malahide - Swords, County Dublin
Between its junction with R105 at Sutton Cross and its junction with R132 at Swords Demesne via Station Road Sutton; Strand Road, Main Street and Coast Road at Baldoyle; Maynetown, Portmarnock Bridge, The Coast Road, Carrickhill; The Mall, Dublin Road and La Mancha Cross in the town of Malahide; Swords Road and Malahide Road all in the county of Fingal.