There will be overnight closures of the A11 between its junction with the B1106 and the London Road roundabout on the nights November 20 and 21.
The closure will be in place from 7pm each evening until 7am the following morning, with clearly signposted diversions via the A1065 and B1107.
Highways Agency project manager, Robert Gibson, said: “Advance works are progressing well. The work we are carrying out during November will allow us to continue to prepare the site ahead of the main construction work.
“These activities all require overnight closures so we ask drivers to allow extra time for their journeys and follow any clearly signed diversion routes.”