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Police are appealing for witnesses, information and dash cam footage following a serious road traffic collision on the A41.
The incident occurred at around 10.10am yesterday (Monday 21 August) on the southbound carriageway between Hemel Hempstead and Kings Langley.
It is believed up to six vehicles were involved in the incident, including a white Mercedes tipper HGV and a black Peugeot.
The three occupants of the Peugeot were taken to hospital. A man and a child, whose injuries are not described as life-changing or life-threatening, were taken to hospital by road.
A woman, meanwhile, was airlifted to hospital with potentially life-changing injuries.
Sergeant Alex Ward, from the Road Policing Unit, said: “Our enquiries are continuing, and we are appealing for any witnesses to please come forward.
“If you were driving in the area and have a dash-cam fitted, please check it as you may have recorded some crucial footage to assist our investigation."
Anyone with information is asked to contact Sgt Ward via email.
You can also report information online, speak to an operator in our Force Communications Room via our online web chat or call the non-emergency number 101, quoting ISR 207 of 21 August 2023.
Alternatively, you can stay 100% anonymous by contacting the independent charity Crimestoppers on 0800 555 111 or via their untraceable online form (opens in new window).
* A 44-year-old man from Ilford, Greater London, was arrested on suspicion of causing serious injury by dangerous driving and remains in custody at this time.