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.