Temporary traffic lights have been erected on Woodbridge Road, between the Playford Road and Bent Lane junctions in Rushmere St Andrew.
It is due to fire hydrant repair work being carried out by Anglian Water, which is investigating a possible leak on one of the water pipes.
The work began today and is expected to be completed by Friday.
A spokesperson for Anglian Water said: “We are sorry if this causes disruption to local residents and road users.”
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