A 23-year-old car driver remains in a critical condition after a two-vehicle crash closed the M4 motorway.

The man was airlifted to hospital in Cardiff following the collision on Monday afternoon between a white Seat Ibiza and a Mercedes Sprinter van.

The crash closed the motorway westbound from Swansea between junction 47 Penllergaer and 48 Hendy for about six hours.

Police have appealed for witnesses to come forward.