Essential repairs to a sewer in Sandgate Road, Folkestone, Kent, start this week.
The work will improve the ageing sewer, which has deteriorated over time, and reduce the risk of it collapsing.
Temporary traffic lights will be in place in sections of the road while the work takes place.
Side roads off Sandgate Road (from Grimston Avenue to Trinity Gardens) will be closed to traffic in phases, although residents’ access will be maintained.
Construction, which is being carried out by contractor Clancy Docwra, is due to complete by the end of February.
Clancy Docwra has liaised with customers living nearby and will remain in contact with them while the scheme takes place.
Southern Water Project Manager Lee Hooper said: “This has been a troublesome sewer in the past and we’re pleased we can upgrade it.
“Work like this can inevitably cause disruption but we and our contractor will do all we can to keep this to a minimum.
“We won’t be there for long but the benefits of the work – the reduced risk of sewer collapse and associated problems - will last long into the future.”