The road was closed to facilitate an examination by Garda Forensic Collision Investigators and has since reopened.
Gardaí have appealed for wintesses to wish contact Clondalkin Garda station on 01-6667600 or the Garda Confidential Line on 1800-666111.
A man in his 20s lost his life in a single vehicle road crash which occurred on the N7 Naas Road near Tallaght this morning.
Emergency services are now dealing with the incident that happened on the Naas Road at around 6.30am.
The driver of received fatal injuries when his 4x4 vehicle collided with a barrier near Junction 2 Kingswood at about 6.20am.
It is understood the accident happened at around 6.30am this morning.
Earlier: A number of emergency service units are attending the scene of a serious crash in Dublin this morning.