Three lanes of the M25 anti-clockwise have been closed for emergency resurfacing following a vehicle fire.
The incident took place between junction 26 at Waltham Abbey, Essex, and junction 25 at Enfield, north London.
National Highways said only one of the four lanes was available for traffic. The work is expected to be completed late in the morning.
There are currently 11 miles of congestion and lengthy delays, according to a spokesperson.
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