Detectives investigating a serious collision on the A406 are appealing for witnesses or anyone with dash cam footage to come forward.
Police were called at 16:52hrs on Tuesday, 26 November to reports of a collision on the A406 at Palmerston Road, N22.
Officers, London's Air Ambulance and the London Ambulance Service (LAS) attended.
At the scene, an Audi A4 had been in collision with a male pedestrian.
The injured man, aged in his 40s, was taken by LAS to an east London hospital where he remains in a critical condition.
The driver of the Audi stopped at the scene and is assisting with police enquiries.
There have been no arrests.
The A406 was reopened to traffic at 23:03hrs.
Anyone who witnessed the collision should call the Met’s Serious Collision Investigation Unit on 020 8597 4874 or via 101 quoting reference 5603/26NOV, or Tweet @MetCC.