Highways England claims its refined plans for the Thickthorn junction at Norwich will improve road safety.
The plans have been influenced by consultations since the preferred option for upgrading the junction was chosen in 2017.
Changes see the previously proposed A47 westbound to A11 southbound free-flow link road replaced with a free-flow left turn at the roundabout.
Highways England says that will reduce the environmental impact of the scheme.
Other changes include traffic lights on the B1127 arm of the roundabout and an additional lane added to the south half of the roundabout.
A reduced speed limit of 40mph is also being suggested for the B1127 between Hethersett and the Thickthorn junction.
Existing junctions to and from Cantley Lane South to the A11 and A47 would also be closed and replaced with a bridge over the A11 to the B1127.
A footbridge for pedestrians, cyclists and horses has also moved closer to its original position.
A plan of the proposals for improving the Thickthorn interchange (Highways England).
Improvements to the Thickthorn junction are part of a £300m series of upgrades to the A47 between Great Yarmouth and Peterborough.
Part of those upgrades include the introduction of dual carriageways in three sections, including between Blofield and North Burlingham and from North Tuddenham to Easton.
It will also include junction enhancements in Yarmouth.
Highways England programme lead for the A47, Peter Havlicek, said: "We’ve continued to refine our plans for the A47, so we can deliver the best possible improvement for this junction.
"We know that there is a lot of support for this improvement, and these changes show how we’re taking onboard people’s feedback to deliver what is needed.
"This upgraded junction is one of six schemes we’ll be doing to improve the A47 between Peterborough and Great Yarmouth, and it’s important that we get it right for road users and the affected communities."
Map showing the different improvements planned along the A47 corridor (Highways England).
Highways England says the upgraded Thickthorn junction, once complete in 2024, will improve journey times by up to six minutes.