Work to reduce flood risk on a mile stretch of the A66 at Embleton began this week.
The Highways England programme includes the construction of new storm drains as well as resurfacing and new road markings.
The work is expected to be completed by the end of April, subject to suitable weather conditions, with a break between 24 and 29 March to minimise disruption at Easter.
Temporary traffic lights will operate 24 hours a day for the safety of crews and drivers.
Full road closures in both directions will also be required on some nights between 8pm and 6am, and at some weekends.
When the road is closed, diversions for HGVs and other vehicles will be clearly signed.
Drivers are advised to use the A591 and the A595. This route is not suitable for HGVs which should use the M6 and A595
Dates of closures will be announced nearer the time.
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