A 10-year-old girl is in hospital in a critical condition after huge crash brought the M4 near Heathrow to a standstill.
Emergency services were called at 1.35pm on Sunday to a four-vehicle collision which led to the eastbound carriageway being shut.
Bank holiday motorists stranded on the motorway faced severe delays between junctions 3 and 4 near West Drayton.
Police, fire and National Highways traffic officers arrived at the scene and the westbound route was blocked to allow the air ambulance to land.
Hillingdon Police said on Monday the girl remained in a critical condition while two adults remained in hospital “with less serious injuries”.
Stranded motorists were pictured stood by their vehicles as the motorway closed.
The incident caused delays stretching back onto the M25.
No arrests have been made.