People are being warned to expect restrictions on the dual carriageway stretch of the A11 Newmarket Road, in Norwich, next month.
Work to replace central reservation safety barriers on the A11 Eaton Bypass will take place from March 2 and is expected to last about 10 weeks.
The project - costing about £314,000 - will take place overnight from 7pm to 7am under lane closures. These will be lifted during the day, but a 30mph speed limit will be in force throughout.
A Norfolk County Council spokesman said: 'This is an essential safety measure because there will be gaps of up to 150 metres in the safety barriers during the works. Replacement of the barriers is necessary because inspections have shown that they are reaching the end of their useful life. Most have been in place since the Eaton bypass opened in 1975.
The contract is being carried out for Norfolk County Council by Lafarge Tarmac.
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