A 19-year-old man was killed and three others seriously injured when the car in which they were travelling overturned near Lucan overnight.
The incident happened near the Spa Hotel, just after 1.30 a.m. There was no other vehicle involved.
Elsewhere, the three young men who died in Co Wicklow when the car they were travelling in collided with a lorry have been named.
Brothers, Michael (22) and James Sheehan (19) of Maurell in Arklow and Mr Wiliam Byrne (22) were named this morning.
Another young man injured in the incident is in a serious condition in hopsital.
The incident happened when their car collided with a lorry between Aughrim and Woodenbridge at about 5.30 p.m. yesterday evening.
A total of seven people died on Irish roads yesterday. Earlier, three people died in Co Antrim when their minibus collided with a truck, and another man was killed in a two-car collision in Wexford.