Motorists have been warned of delays on the M25 in Hertfordshire. (Image: aitoff (Pixabay))
There remains heavy congestion on the M25 in Hertfordshire following an earlier incident.
Herts police has warned motorists of traffic due to an alleged "medical incident" at South Mimms service station.
The force thanked motorists for their co-operation.
Emergency services have been contacted for further information.
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