R811 road (Ireland)
The official definition of the R811 from the Roads Act, 1993 (Classification of Regional Roads) Order, 2012  states:
- R811: South Circular Road, Dublin
- Between its junction with R138 at Leeson Street Lower and its junction with R114 at Harcourt Street via Adelaide Road, Harcourt Road (and via Harcourt Street, Hatch Street Upper and Earlsfort Terrace) all in the city of Dublin.
- between its junction with R114 at Richmond Street South and its junction with R111 at Suir Road via Haddington Street and South Circular Road all in the city of Dublin.
- Statutory Instrument 54 of 2012 Roads Act 1993 (Declaration of National Roads) Order, 2012, Irish Statute Book (irishstatutebook.ie). (HTML file), 2012-02-28.