Delays have eased on the N7 Naas road and Red Cow Interchange following a power cut at traffic lights this morning.
According to AA Roadwatch, inbound traffic was heavy earlier this morning from the J3 Citywest to the Red Cow Interchange.
Traffic was also severe on the N7 outbound right hand turn to the Fonthill road, and outbound motorists seeking to access Monastery Road were diverted via Newlands Cross and inbound on the N7, causing further problems.
The Red Cow Interchange congestion also caused major delays coming off the M50 northbound at J9 - with traffic extending back to before J10 Ballymount, AA Roadwatch added.
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Gardaí attended the scene at the Red Cow Interchange.