A man has been seriously injured in a crash on the M50.
It happened when a car collided with a truck at Dundrum shortly before 10 o'clock this morning.
Dublin Fire Brigade says its paramedics had to use cutting equipment to free the man from the vehicle.
The motorway is still closed southbound between Junction 13 Ballinteer and Junction 14 Leopardstown Road.
Gardaí have asked onlookers to move along as this is contributing to the high traffic levels.
There is now a second RTC on the approach to the original RTC after J13 on the @M50Dublin. This has resulted in traffic being diverted off the #M50 at J13 to rejoin on J14. Avoid the area. @aaroadwatch pic.twitter.com/Gs5U4V5uug— Dublin Fire Brigade (@DubFireBrigade) 5 September 2018