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The project will serve residents of the new 750-home Bishop's Stortford South estate, St James' Park.
The stretch between the Tesco and Stansted Road roundabouts will be closed for several days and traffic diverted through the town centre.
The incident happened on the northbound carriageway between junctions 6 (M25) and 7 (Harlow).
Essex Highways is due to meet a landowner on site to discuss ditch clearance to prevent further flooding of the main B1383.
Residents say flooded B1383 closure is down to poor maintenance of blocked drains and not the River Cam bursting its banks, as county council says.
Week-night work to renew lighting to begin Monday December 14 and end in mid-April, with a break over Christmas and New Year.
The measures are part of a drive to make travel safer over the festive period as families take advantage of an easing of Covid-19 restrictions.
Newly-released figures for December show how freight is keeping the hub working during the coronavirus crisis.
Stansted owner MAG launches fight to win consent for growth to 43m passengers a year with scathing attack on SSE vice-chairman Brian Ross.
The jets were scrambled from RAF Coningsby in Lincs after communication problems were reported with a private flight from Germany to Birmingham.