Large sections of the A47 are to be closed nearly every night over the coming weeks.
The major road will be shut in two sections in Norfolk including between the Toftwood junction in Dereham and the Norwich Road roundabout in Swaffham.
This closure will be in both directions running from 8pm overnight until 6am.
It is the latest closure amid six months of work at Necton that will continue every weeknight until February.
An official diversion route will be put in place westbound via the A1075, A11, A134, and A1065, before re-joining the A47 westbound at Swaffham, with the eastbound route in reverse.
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The road will also be closed between the Fakenham Road junction to the Norwich Road roundabout in the eastbound direction only.
The closure runs for the same period as it is part of the scheme.
A spokesman for National Highways said: "We apologise for any inconvenience caused and thank you for your patience while we work to improve the road."
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