A 27-year-old man has been arrested on suspicion of causing death by dangerous driving after a woman died in an accident on a main Cardiff road.
The accident involved two lorries and two cars on the southbound carriageway of the A4232 near Culverhouse Cross.
The woman's family have been informed and are being supported by family liaison officers.
The 27-year-old man is in custody at Cardiff Bay Police Station.
The road was closed in both directions to allow the Air Ambulance to land.