The A15 near Dyke will be resurfaced this week.
Work will begin tonight (Tuesday) and will last until April 25. The road will be closed overnight from 7pm to 6am on weekdays to reduce disruption to motorists.
The following diversion will be in place: the A15 South to Market Deeping, northbound from Market Deeping via the A1175 and A16 past Spalding to the A17 near Algakirk, onto the A17, taking the A17 up to Bicker Bar Roundabout and taking the A52 back onto A15. Vice versa for southbound.
A Lincolnshire County Council spokesman said: “This is a lengthy diversion so please allow extra time for your journey. Access will be maintained for residents and emergency services.”