A Watford road is closed for resurfacing.
Langley Road is shut from the junction of Hempstead Road to the junction of St Albans Road in both directions.
Work on the worn-out sections of the road began on Wednesday and are due to be completed by August 6.
Eurovia, on behalf of Hertfordshire County Council, will be carrying out the work between 9.30am and 4.30pm.
A diversion route is in place along Hempstead Road.