No injuries have been reported.
The N4 in Dublin is currently closed at the turn-off for Dodsboro in the outbound lane as a truck has overturned.
Gardai say no injuries have been reported but the incident is causing very heavy delays through Lucan Village as traffic is diverted.
There was also a minor collision on the inbound lane which is resulting in heavy delays as far back as as the turn-off for Maynooth.
Gardaí and Emergency services with heavy lifting equipment are currently at the scene of an overturned truck on the N4 Westbound at the Dodsboro exit.
Three lanes Westbound and two lanes Eastbound are blocked.
Motorists should expect long delays in both directions.
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