The official definition of the R811 from the Roads Act, 1993 (Classification of Regional Roads) Order, 2012[1] 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 and 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.
