It's illegal to walk some parts of the South Ring/South LinkIts legal to walk on the South Ring road afaik.
Got caught one night years ago just on grass by the Garage.
About 6 of us going to a buddies house in Ballinlough, said no point in getting 2 taxis so was faster to walk that way and off at the Borreenmanna Slip Road.
Nice summers evening had a few in town was about 11 o clock had just gotten dark tbf.
Guards escorted us off the road and told us not to do it again as it's a illegal to walk a dual carriageway due safety and lack of infrastructure, we pleaded the polite case of there's a grass bank. They weren't having it.
How true or false it is I don't know, but you never see people walking there.
For my buddy it's definitely faster to walk that way but we don't do it anymore as do not want to take the chance of a fine but also because we are rarely in town much. Mainly stay local.