Motorists are facing seven weeks of disruption in the latest set of A47 closures.
Lanes will be closed overnight on the stretch of road in Honingham - adding delays for drivers travelling between Norwich and Dereham.
The roadworks will see a second drainage tank being installed between 8pm to 6am Monday to Friday.
READ MORE: Two abnormal loads to cause delays on A149 in Norfolk
The stretch of road, between Easton and Honingham, to the west of Norwich, has flooded at least eight times since last October.
The work began on July 10 and will continue until August 30.
A spokesman for National Highways also warned there may be some "noise disruption" in the area.
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