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Traffic is building up in the Darford Tunnels this morning following a three-car crash.
It happened on the M25 anti-clockwise after junction 30 A13, for Lakeside, Essex.
Three vehicles involved and two lanes of the motorway remain closed.
Essex police are at the scene and say no serious injuries have been reported.
The crash is causing congestion between M25 J3 (M20 Swanley Interchange) and the Dartford Tunnel.
KCC Highways advises drivers to allow extra time.
A statement reads: "There is slow moving traffic on the M25 anti-clockwise between M25 J3 (M20 Swanley Interchange) and the Dartford Tunnel due to an RTC in Essex near to J30 causing severe anti-clockwise delays.
"Please allow extra time for your journey."
A spokesman for Essex Police said: "We are currently on scene following a collision on the M25 Northbound, between junction 29 and 30.
"Three vehicles have been in collision.
"No serious injuries have been reported.
"Drivers are asked to please avoid the area."
Read more: All the latest news from Dartford
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