The motorcyclist, a man ages in his 60s, was taken from the scene by air ambulance to Beaumont Hospital where he has since passed away. The driver of the car was uninjured.
A technical examination of the scene has taken place.
Gardaí are appealing for anyone with information, particularly any road users who may have dash-cam footage, to contact them at Carlow Garda Station on 059 913 6620 or the Garda Confidential Line on 1800 666 111.
