Two lanes are closed on the M25 anticlockwise between Junctions 24 and 23 near Potters Bar and South Mimms, due to a broken down lorry.
Officers are at the scene, where the lorry can’t currently be moved due to its brakes locking on.
Traffic is at a standstill anticlockwise between Junctions 26 and 23.
The incident is expected to clear by 8.45am, and normal traffic conditions are expected at around 10am.
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