An overturned lorry and fuel spillage closed entry to a motorway.
Highways England reported the incident as being on the entry slip road at junction 20 of the M25 clockwise.
The slip road has now reopened.
Hertfordshire police and Highways officials were on the scene following the incident which happened this morning.
Hertfordshire Fire and Rescue Service were also sent and reported that no one was injured.
Highways England tweet
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