Police, fire and ambulance services rushed to the scene and carried out precautionary medical checks on three people.The crash has caused a backlog of traffic to the A414 and A41
As of 5.53pm, there were still delays on the M1 but they are beginning to ease, according to Google Maps. There are also reportedly 40-minute delays on the A41 near Kings Langley, though it is unclear if a separate incident is adding to congestion. Herts Fire and Rescue Service sent engines from Hemel Hempstead and Garston stations to the M1 crash at 3.52pm, where crews found four vehicles involved.
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