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.
Dallas Cowboys RB Ezekiel Elliott ready for 'long battle' over suspension
At the time, Elliott was a new member of the Cowboys, having been drafted fourth overall following a stellar career at Ohio State. Yahoo's Charles Robinson reported that Elliott "is willing to take this whole suspension appeal through courts if he has to".
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.