The affected area includes the Kinsale Road Roundabout as far as Sarsfields Road.
Gardai at Anglesea Street are warning motorists of an oil spill on the South Ring Road in Cork city.
The spillage extends from Vernon Mount to the Sarsfields Road Roundabout westbound.
Gardai and the fire service are at the scene and it may be necessary to close off a section of the road while the clean up continues.
