The collision happened just before midnight on Saturday.
A teenager is in hospital after suffering serious injuries after his car collided with a loose horse on the M8 in Co Tipperary.
Gardaí were alerted to a serious road traffic collision on the M8 at Cahir Abbey Upper just before midnight on Saturday 16th July.
A horse broke out and got onto the motorway and a vehicle collided with it.
The male driver, in his late teens, sustained serious injuries and was taken to Cork University Hospital.
Gardaí are appealing for witnesses to come forward.

Bus Éireann Confirms January Expressway Fare Increase, Cites Insurance And Fuel Costs
NTA Plans 24-Hour Bus Linking Newbridge, Naas And Dublin City Centre
Visiting Only Allowed For Critical Or Compassionate Reasons At Naas Hospital Amid Surge In Flu Cases
Turn2Me Reminds Locals Feeling Down Over Christmas Period To Avail Of Supports Available
Four Naas Car Parks Go Free For Christmas - But Illegal Parking Still Enforced, Says Council
Up to €400,000 Spent, Answers Yet To Be Published: Fianna Fáil TDs Demand Aras Bid Campaign Review
Family Member Questioned After Deaths Of US Filmmaker Rob Reiner And Wife
Tractor Convoy To Reach Naas At Around 11am As Irish Farmers Head For EU Protest