A man is in a serious condition in hospital after a crash on the M50 in Dublin that closed southbound lanes from the M1 to the Red Cow junction.
Gardaí say at least three vehicles - a car and two lorries - were involved in the crash at around 11am. Other reports suggest as many as five vehicles were involved.
A considerable amount of debris is understood to have been scattered across the area near the Ballyfermot junction where the crash happened.
Northbound lanes were not affected, but a southbound stretch of the motorway closed for around five hours and traffic was diverted.
The road re-opened shortly after 4 pm but heavy backlogs of traffic are being reported on and around the M50, particulalrly at junctions on the west of the city.
Traffic is heavy from Tallaght to the Red Cow and approaching the M1 and southbound from the Red Cow to the toll plaza. The disruption has had a knock-on effect on the Red Cow roundabout for traffic from the Naas Road.