Severe delays are expected anti-clockwise at junction 26 following the overnight closure of two lanes and slip road.
The Highways Agency will close the M25 lanes both anti-clockwise and clockwise between junctions 26 and 27 from 10pm to 5.30am, tonight.
The Junction 26 carriageway slip road for Waltham Abbey will also be closed during this time.
A diversion will be in place via Junction 25 for Waltham Cross.
The estimated cost for the works, that are expected to finish at the end of the month, is £188m and will include new signage and lighting.
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