The Orwell Bridge will be partially closed for the next two days as repairs continue.
The entire westbound section of the A14 bridge, near Ipswich, will shut between 21:00 BST and 05:00 on Tuesday and Wednesday.
The road is scheduled to fully reopen on Thursday 19 September by 05:00.
Diversions, external have been put in place.
The work has been deemed urgent after a routine inspection on 6 September identified one of the bridge joints was in a "potentially unsafe condition".
National Highways previously said: "Expansion joints on structures like the 42-year-old Orwell Bridge are specifically designed and an integral part of the road.
"As a result, it is not a simple task to replace/repair them and it requires specific equipment and planning to do."
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