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Traffic was held on the M25 following a crash.
The accident happened between Junction 5 at Sevenoaks and Junction 6 near Godstone.
Highways England said all lanes had been closed as engineers worked to clear up oil spilled in the collision - which happened at around 9.45am.
Traffic was released at about 2.45pm and a second lane was reopened at 3.30pm.
All lanes had reopened just after 5pm.