A burst water main has closed Old Cross between the junction and Hartham Lane.
Reports on social media say the road wasd closed from 9pm last night, to allow Affinity water to attend the incident.
Hertfordshire Highways tweeted on Friday morning advcising peiople to avoid the area.
On Friday afternoon the water main had been repaired but the road closure was still in place, although some traffic was ignoring the signage and passing through regardless.
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