Works to improve the safety of an accident blackspot on the A47 should take place later this year.
National Highways - which is responsible for the busy road - said improvements were planned for the A47's junction with Tuns Road - which leads south to Necton - and the nearby junction with Dunham Road - which goes north to Little Dunham.
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The agency said the works would happen "this summer" and would include widening the junction to increase its capacity and reducing congestion into the villages.
National Highways said: "This will also include renewal of road markings and drainage."
The announcement follows a meeting between the agency, Mid-Norfolk MP George Freeman, and parish, district and county councillors at Necton Community Centre on July 21.
Necton is set to become the site of a large substation belonging to Vattenfall, the Swedish energy giant.
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Mr Freeman said: “When counties like Norfolk and villages like Necton are hosting critical national infrastructure like the Vattenfall substations, I believe local communities should benefit from the disruption and the impact.
"Having successfully campaigned to get the substations moved from the high ground at Dunham down to Necton, I’m now working to ensure maximum benefit for the people of the village."
Mr Freeman said the biggest issue for locals was the "dangerous" junction on the A47.
Mr Freeman said he had long campaigned for safety improvements to be made at the junction.
He said he and local councillors had managed to get National Highways to commit to a study of the junction and its safety in 2018.
And in June, Mr Freeman said he had written to the body's regional director to request another site visit and meeting to finalise plans for the site, and consider reducing the speed limit there from 50mph to 40mph.
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