Police have released the name of a woman killed in a crash at Manakau, near Levin last Thursday.

Nicola Baillie, 51, of Palmerston North, died when two cars collided on State Highway 1 near Kuku East Road, north of the Manakau township around 5.30pm.

Three other people were taken to Palmerston North hospital in serious and moderate conditions, a St John's Ambulance spokeperson said.

Two women, one in her 20s and another in her 50s, along with a man in his 60s, were all reported as stable the day after the crash.

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The incident caused major delays on the highway, with the road closed for nealy two hours and traffic backed up several kilometres in both directions while the Serious Crash Unit attended the scene.