Three parts on a 115-mile stretch of the route are set to be dualled, featuring upgrades to several junctions and roundabouts.
Preferred options for the schemes have been selected following six successful public consultations.
The projects are all part of a £15 billion investment in England's motorways and major A roads, with £3 billion being invested in the East of England.
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Around Norwich, work includes dualling of the A47 between North Tuddenham and Easton, further east, between Blofield and North Burlingham, along with junction improvements at the Thickthorn Interchange with the A11 plus two busy junctions in Great Yarmouth, on what was formerly the A12.
Further west at Peterborough, the work involves dualling a busy stretch between Wansford (A1) and Sutton, and improving the Guyhirn junction with the A141.
Philip Davie, Highways England Programme Leader for the A47, said: "Delivery of these projects will improve users journey times and safety, so this work is a priority for Highways England.
"We have listened to the publics' views and these have helped shape and inform our approach to our proposed schemes. Work now continues, adding detail to the design for each of the dualling and junction improvements, and on planning how we will deliver them in a way that keeps traffic moving."
(LM)
