Police blocked access to the westbound carriageway of the motorway at junction 23 from 1.30pm
The entry slip road to the M25 at South Mimms has been reopened after emergency services cleared an overturned lorry.
Police blocked access to the westbound carriageway of the motorway at junction 23 from 1.30pm when the 16-wheeler rolled on the slip road.
The driver was taken to hospital with leg injuries but his condition was not thought to be serious.
The lorry has since been recovered and the scene has been cleared.
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