The scene on the M1 southbound. Photo: Highways England
All lanes are currently blocked on the M1 near Watford.
Ambulances are at the scene of a collision between three vehicles on the southbound carriageway between j6 for Bricket Wood and j5 for Watford.
Traffic is currently at a standstill.
There were already delays in the area after one lane was blocked on the exit slip road at j5 due to a two vehicle crash.
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