Radlett Lane will stay closed after a second water main burst.
Affinity Water has been carrying out repairs near Shenley Park since Friday and the work was completed yesterday as scheduled.
Radlett Lane was open for a short while last night but the water supplier has confirmed the road has had to shut again due to another water main which has burst a little further down the road.
Affinity Water tweeted: "We have an urgent road closure in place to safely carry out repairs to a burst water main on Radlett Lane, near Shenley Cricket Centre.
"We're sorry for any disruption caused to your journey."
Affinity Water have been given a permit of until Friday to complete the repair.
It is bad news for drivers who are already coping with the long-term closure of Harper Lane at the junction with Watling Street, due to the installation of traffic lights.
The latest repairs in Radlett Lane mean drivers will have to continue to divert via Borehamwood or Park Street to bypass the closures in Radlett Lane and Harper Lane.
Resurfacing work scheduled to take place on Friday (September 11) in Radlett Lane at the junction of Porters Park Drive has been postponed.
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