Police are appealing for witnesses or any drivers with dashcam footage following a collision between a lorry and an elderly man in Hammersmith.
Officers were called to Fulham Palace Road at the junction with Nella Road, W6, shortly before 09.00hrs on Thursday, 15 October.
A 92-year-old man was found seriously injured. He was treated at the scene by paramedics before being taken to hospital, where he remains in a critical condition.
The driver of the red Volvo tipper truck stopped at the scene and is helping police with their enquiries.
Any witnesses, especially those with dashcam footage, are asked to contact the investigation team on 0208 543 5157 using the reference CAD1756/15OCT.
Enquiries into the circumstances remain ongoing.