Drivers should expect "significant" congestion on a section of the A47 this weekend as work at a key junction gets under way.
National Highways has warned people to allow extra travel time from 6am on Saturday as three-way traffic lights are placed at the Dunham Road and Tuns Road junctions in Necton.
The lights will remain in place until 6am on Monday.
A £2.2m project to widen the junction mouths, which began at the end of September, is expected to take around five months to complete, reopening fully in March.
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To minimise disruption, the majority of work has taken place on weeknights between the hours of 8pm and 6am but the agency claims weekend work is necessary to complete the project on time.
During this time access to Necton will be maintained via Rudge Way, located next to Costa Coffee, as nearby Tuns Road will be closed between the A47 and St Andrews Lane, and there will also be no access or entry to the A47 from Dunham Road.
Alice Grandidge, National Highways' project manager for the junction improvements, said: "We have sent out thousands of letters to local residents and businesses.
"Signs are in place as far away as Norwich and King's Lynn to advise of expected delays and we will also have traffic contractors on site to adjust the phasing of the traffic lights to ensure traffic flow is maximised over the working weekend."
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