A busy main road near St Albans will close overnight following a 20-day closure last month.
Hertfordshire County Council is carrying out "major" works on the A5183 Redbourn Road, which links St Albans city to the M1 at Redbourn.
The road will be shut overnight on April 11 between 8pm and 5am to install an anti-skid road surface.
Diversion routes during closures are via the A5183 Redbourn Bypass, B487 Redbourn Lane, A1081 Harpenden Road, Batchwood Drive and vice versa.
An HCC statement reads: "The improvement works will take approximately three weeks (weather dependent) and a road closure is required for safety."
The county council has said it will resurface and reconstruct the existing carriageway, resurface the footways, improve road signs and studs, and repair the drainage system.
The original 20-day closure was in place between March 1 and March 20.
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