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A motorcycle crash near the Dartford tunnel caused long delays for drivers.
The M25 anticlockwise was closed for more than an hour due to the accident just after 8am.
There was still heavy congestion several hours later, with traffic queuing back to the Darenth Interchange.
Delays have since cleared.
An Essex Police spokesman said the crash at 8.10am involved a silver Ford S-Max car and a motorcycle on the A282 junction.
Both tunnels were shut in the aftermath of the crash, but had reopened by 9.30am.
No one was seriously hurt.