Emergency services closed all north bound lanes on the M50 at the junction 16 Cherrywood exit after a car overturned this evening, spilling petrol across the motorway.
The road later reopened.
Gardaí have said there are no serious injuries a result but peak-hour Friday traffic was severely disrupted.
The incident occurred at approximately 5pm when traffic flow is at its heaviest.
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It is unclear exactly what happened to cause the car to overturn. The small black saloon was hoisted onto a breakdown truck and emergency services cleaned up the discarded fuel.