Five people - four of them in their 20s or younger - have died on the roads during the bank holiday weekend.
Shortly before 6pm on Saturday, Eleanor Ahern (25), Watergrass Hill, Cork, died when the car she was driving was in collision with a second car near Fermoy. The accident happened at Monadrishane, Kilworth, on the N8 between Fermoy and Mitchelstown.
A male passenger in the car was taken to Cork University Hospital for treatment, while the driver of the other car and his passenger were not seriously injured.
In Co Meath, on Saturday morning, Francis Griffin (44), Ratoath Drive, Finglas, Dublin, died when the car he was driving was involved in a three-car collision on the N2 south of Ashbourne.
The accident happened at 10.30am at the Whitetree Lane Junction and involved another car as well as a van.
The female driver of the other car was treated for shock at Connolly hospital in Blanchardstown.
In Co Mayo, shortly before 1am on Saturday, Patrick McDonnell (18), Bangor Erris, Belmullet, was fatally injured when the car in which he was a passenger left the road at Kiltean, near Bangor Erris.
The driver and three other passengers were taken to Mayo General Hospital in Castlebar.
Mr McDonnell was pronounced dead on arrival in the hospital.
In Co Cork, at 12.10am on Saturday, a Polish national Przemyslaw Kiferling (27) was killed when the car he was travelling in appears to have gone out of control. It hit a ditch in Gurravesogue, Riverstick, near Kinsale.
The male driver of the car was treated for minor injuries at Cork University Hospital. No other vehicle was involved.
In the North, a 19-year-old man was pronounced dead at the scene of a crash at the Ballynahinch Crossroads on the Cumber Road, near Hillsborough in Co Down.
The car in which the man had been travelling was in collision with a second car shortly after 9pm on Saturday.
A PSNI spokesman said a second person in the car was taken to hospital but no details were available on their condition.
A number of people travelling in the second car were also admitted to hospital but their injuries were not thought to be life-threatening.
