A 1.5m high soil wall has been built next to part of the A47 in the latest attempt to stop the road being repeatedly flooded.
The road, to the west of Norwich, has flooded five times in recent weeks, with the issues near Honingham coinciding with preparatory work to dual the road between Easton and North Tuddenham.
National Highways, which is responsible for the road, insisted issues are not linked to its work, but has been trying to tackle problems which twice forced the road's closure.
Engineers had hoped fixing a broken pipe on nearby land would solve the issue, but more preventative work has had to be done.
The latest work has seen a compacted soil wall built at the bottom of farmers' fields to try to stop water running off them.
A National Highways spokesman said: "Following the recent issue, where field run-off led to the partial blocking of a new replacement drainage pipe and channel, a 1.5m high section of ‘bunding’ – which is a type of compacted soil wall – has been constructed.
"This is a conservation measure used to limit soil erosion and water run-off and has been built at the bottom of farming fields close to the site of recent localised flooding.
"Further preventative measures put in place over the last week include installation of ‘silt fencing’ to limit silt-type material blocking the drainage network and, following discussions with National Highways engineers, adjacent fields to the A47 have also been ploughed.
"This work should help to significantly limit the issue of silt and water run-off."
"Until we can be certain the issue of flooding has been completely resolved we will continue to carefully monitor the location and additional pumping equipment will remain on standby to limit inconvenience to road users."
George Freeman, Mid Norfolk Conservative MP, spoke to National Highways bosses on Monday to press for a resolution.
He said: "The A47 is a major strategic national arterial route for Norfolk used by both long haul business and local residents and businesses and it’s not acceptable to have it disrupted by flooding.
"The people of Mid Norfolk and Norfolk, more widely, rely on this road and need to see it kept flowing as easily as possible during the period of the dualling works."
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