A young woman has been left fighting for her life after being struck by a car on the A12 in east London.
The pedestrian, 22, was rushed to hospital following the crash at Gallows Corner in Romford on Wednesday night.
She remains in hospital in a critical condition. Her next of kin are aware.
Police and paramedics were scrambled to the busy road at about 8.50pm.
The driver of the car stopped at the scene and was not arrested.
Met Police Detective Sergeant Jose Qureshi is leading the investigation.
He said: "Officers from the Serious Collision Investigation Unit are working to establish the full circumstances surrounding this incident.
"I am asking for anyone who witnessed the incident, or who has dash cam footage, to make contact with us as soon as possible."
Anyone with information asked to contact the SCIU on 0208 597 4874. Alternatively tweet @MetCC or call 101 ref CAD 7861/19.
