Traffic has been stopped on a busy stretch of the M25 due to a crash.
The incident is on the M25 clockwise between J18 (Chorleywood) and J19 (Watford).
Traffic has been temporarily stopped, with delays of 45 minutes on approach.
National Highwats has urged drivers to allow extra journey time.
The incident is expected to clear and normal traffic conditions return between 11pm and 11.15pm tonight.
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