A driver has been arrested after a two-car crash on the M4 in Berkshire.
The accident happened between junctions 12 and 13 on the eastbound carriageway just after midnight on Sunday.
A family of four from Swindon travelling in a blue Ford collided with a black Hyundai, driven by a 26-year-old man from Bracknell.
A 20-year-old woman is in hospital with serious injuries. The driver of the Hyundai was arrested on suspicion of driving over the alcohol limit.
He has been released on police bail pending inquiries.