Police are on the scene of an accident in Redbourn.
A vehicle broke down at a roundabout at around 7.30am today on the B487 Hemel Hempstead Road in Redbourn.
Delays are mounting between the A4147 northbound to the roundabout with A5183.
The road has been closed by police and drivers are advised to take an alternative route.
There are temporary signal delays on approach, and long delays in both directions.
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