The project to increase capacity of the junction and refurbish the bridge over the A47/A15 roundabout & junction, known locally as Rhubarb Bridge, started during January 2019 and will run until Winter 2019.
The project is being carried out by Skanska on behalf of Peterborough City Council and will see structural repairs made to the bridge.
As well as the bridge repairs, signalised pedestrian crossings and ground-level footpath across the roundabout will be installed. Upgrades to street lighting and traffic signals at the junction will also be carried out.
The work is being part funded by the Cambridge and Peterborough Combined Authority who carried out a structural survey on the bridges, which confirmed that they could be maintained.
From Tuesday April 23 work switched to the south side of the roundabout with a single lane exit and entrance onto Bourges Boulevard in northbound and southbound directions.
It is anticipated that two lanes will be open to traffic using the roundabout at all times, but motorists are being urged to expect some disruption.
This stage of the work will last for around eight weeks, with the traffic management system in place 24/7.