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- The M25 was shut anticlockwise within junction 20 (A41)
- A "serious" crash involving a motorcyclist led to traffic being diverted, National Highways said
- There were 90-minute delays and seven miles of traffic back towards London Colney
- A motorcyclist was taken to hospital "as a precaution", police said
- They were taken to Watford General for further assessment and a treatment for a leg injury, the ambulance service added
- The motorway has since reopened and delays eased
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