Emergency water repairs are causing disruption for drivers and bus passengers.
A stretch of Leggatts Way near the A41 in North Watford has been closed since the weekend.
It is thought to be shut between the junctions of Ashfields and Heather Lane.
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Affinity Water says it is carrying out essential maintenance while Sullivan Buses has tweeted that it is water main repairs.
Hertfordshire County Council has granted Affinity Water a permit of until Thursday (October 13) to get the road back open.
The closure has been causing major delays, particularly during morning rush hour.
Among the roads affected have been the A41 North Western Avenue towards The Dome roundabout, Courtlands Drive and Ashfields, and High Road and Aerodrome Way from Leavesden towards Watford.
Sullivan Buses says buses are being diverted via Ashfields, Courtlands Drive, Gammons Lane and Leggatts Way (where it is open).
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Meanwhile, more Affinity Water roadworks in Hempstead Road, near Langley Road, is now due to finish tomorrow (October 12) rather than today.
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