A crash has occurred on the N7 Naas Rd inbound in right lane at Red Cow roundabout.
Bad weather is also causing serious delays in the capital, as commuters make their way home.
AA Roadwatch posted online: "Gardaí are dealing with an incident on the N7 Naas Rd inbound in right lane at Red Cow Interchange."
Elsewhere, a coach has broken down on East Wall Road, causing delays outbound from the city centre.
Dublin City Council's traffic management centre tweeted: "Coach broken down on East wall Road outbound at junction with Alexandra Rd. Blocking middle lane and causing delays."
There are also delays to North and Southbound DART services due to a mechanical fault on a DART at Clontarf, with more updates to follow.
Gardai were forced to close the Naas Road after a crash.
It has just re-opened but there are very large delays in the area.
Motorists have been warned to avoid it if possible.
Motorists are reporting heavy delays on the approach roads onto the M50 northbound.