He was pronounced dead in hospital a short time later.
There were no other vehicles involved in the collision and the man was travelling alone.
The road was closed to allow for a forensic exam, leading to tailbacks and diversions in the area.
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Emergency services are continuing to deal with a serious crash that happened on the Naas Road in the early hours of this morning.
The driver of received fatal injuries when his 4x4 vehicle collided with a barrier near Junction 2 Kingswood at about 6.20am.
Gardai wish to appeal for witnesses to contact Clondalkin Garda Station on 01 6667600, The Garda Confidential Telephone Line 1800 666 111 or any Garda Station.