A busy road in Chiswell Green will be partially closed for more than two weeks for road works to take place.
Drivers can expect congestion around Watford Road when it is closed for carriageway treatment from 9am to 6pm between June 1 and June 18.
It will be shut from the Noke roundabout to the start of the dual carriageway.
Temporary traffic lights will also be in place. The work is being carried out be Hertfordshire County Council contractors, Ringway.