A popular cut through will be closed for a month due to roadworks.
Grove Mill Lane is now closed 24/7 near Old Mill House until October 17 due to the replacement of an iron gas main, according to roadworks.org
There will still be access to Whippendell Woods and The Grove from Langleybury Lane.
Grove Mill Lane is well-used during morning rush hour by drivers who try and avoid the queues on the A41 and Hempstead Road towards Watford.
A previous full road closure was in place between July 30 and August 12 due to gas work.
Diversion signs are in place.
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