Work is being carried out on the main A1067 Norwich-Fakenham road to help allow faster internet speeds in the area
Openreach, the communications company formerly owned by BT, is laying fibre optic cables under the road and will be using traffic lights from 9pm-6am until August 10.
Closures will take place one after the other on three stretches between Pensthorpe Natural Park and the junction near Stibbard village.
Engineers will move manhole to manhole to install new cables, giving the fastest internet speeds available.
A spokesman for Openreach said: "Our engineers will be putting the new fibre in the ground, so on occasions will need to use temporary traffic lights to make sure they can work safely.
"We're doing all we can to keep any disruption to a minimum and will aim to get the work completed as quickly as possible."
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