The Metropolitan Police were alerted to the incident involving a car and pedestrian in New Road at 8.18pm on April 25.
Officers were dispatched to the scene with paramedics from the London Ambulance Service, where a 45-year-old man was found suffering serious injuries.
He was treated at the scene before being taken to hospital.
A spokesperson for the Met has confirmed that his injuries are potentially life-changing, if not life-threatening at this stage.
The crash is under investigation by the Serious Collision Investigation Unit, with work underway to establish the circumstances surrounding the incident.
A spokesperson said: “Police were called to New Road, RM13 at 20:18hrs on Friday, 25 April following reports of a collision involving a car and a pedestrian.
“Officers attended the scene alongside the London Ambulance Service who treated a 45-year-old man for serious injuries before taking them to hospital.
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“The man suffered from life-changing/threatening injuries and they currently remain in hospital.”
Witnesses to the crash or those who may have dash cam footage of the incident or moments leading up to it should get in touch via 101, with reference CAD 7371/25APR25.
To remain 100% anonymous contact the independent charity Crimestoppers on 0800 555 111.
