Gardaí and emergency services arrived at the scene.
Traffic can pass now on the M50 northbound in the middle and right lanes after Junction 9 Red Cow.
The road was temporarily closed as emergency services dealt with a multi-vehicle collision.
The incident happened around 7:20am at Junction 9 which involved five cars.
Traffic is slow on approach from J12 Firhouse. Southbound traffic is also slow coming up to the incident from before J6 Blanchardstown.
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