Police are appealing for information and witnesses after a woman was hit by a car in Hayes.
It happened on Monday afternoon at just after 2pm in Station Road.
The woman was taken by London's Air Ambulance to an east London hospital where her condition is described as critical but stable.
The female driver of the car - a black Vauxhall Zafira - stopped at the scene. She was not arrested.Officers from the Collision Investigation Unit at Northolt are investigating. Anyone with any information is asked to call the witness line on 020 8842 1817.