Motorists are advised to exercise caution following reports of a collision on the N40 South Ring Road, westbound, near the Douglas flyover.
Drivers should take care on approach and consider alternative routes where possible.
€713 million investment in regional and local roads for 2025 announced, with key projects in Cork including the R595 Skibbereen to Baltimore.
Crews will return to the site at daylight to complete works and return normal supply to the plant for treatment.
Cork City Council is monitoring the situation and may implement traffic management if necessary.
Wet and blustery morning with heavy rain and spot flooding possible in the south. Clearing to sunny spells later.