Highways England has announced overnight road closures on the A1 motorway due to installation works.
The road will be closed in both directions from junction 4 (Hatfield) to junction 6 (Welwyn) from 10pm until 5am for two nights beginning 1 September.
This is to allow work to install two key gantries weighing a combined 76 tonnes to be completed.
Highways England project manager Mark Saunders said: "This work is necessary to complete the gantry work on the A1(M) and will involve using a crane to lift the gantries into place."
During the closures, traffic will be diverted via the B197 and A6129.
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