Four people, including two teenagers, have died following crashes on both sides of the border over the weekend.
The first crash happened near Cahirciveen in Co Kerry on Friday night. An 18-year-old man was seriously injured in the collision and died at Kerry Regional Hospital last night.
Elsewhere, a 15-year-old cyclist died yesterday evening from injuries he sustained in a collision with a car near Mullingar on Saturday.
In the North, meanwhile, two motorcyclists were killed in separate accidents in Co Antrim and Co Down yesterday.
A 68-year-old man died after a crash on the White Park Road in Antrim, while the second man died in a collision involving two cars in Killyleagh, Co Down.