Police were called to A11 at Wymondham, at 2.13am on Sunday 3 August 2025, following reports of a collision involving a grey BMW 3 series M Sport and a silver Honda Civic Type R.
There were two further collisions, involving a white Mercedes lorry and a red Mazda CX-5, at the same location within minutes of the first collision. In total, four vehicles were involved.
The road was closed whilst emergency services attended the scene including fire and ambulance.
The driver of the Honda was taken to hospital with injuries which were initially thought to be serious. He has since been discharged.
Four other people were treated for minor injuries.
The road reopened at around 2.20pm.
Officers would like to speak to anyone who may have witnessed the collision or who may have any relevant dashcam footage.