A lorry carrying cardboard bales flipped over causing hours of traffic jams.
The HGV turned over on the roundabout near Asda Lancaster at 7.40am on Saturday morning, police said.
The driver wasn’t injured but was taken to hospital as a precaution.
The Fire Service put foam on oil that was spilled on the road.
Traffic diversions were in place before the road was fully reopened at 12.53pm.