The family of a woman who died in a four vehicle crash over the Queen's Birthday weekend are "devastated" by her death.

Susan Mary McLeod, 58, from Kaiapoi, was a pillion passenger of a motorcycle when it crashed into the back of a car waiting to turn right at the junction of State Highway 1 and Harleston Rd on May 31. She died at the scene.

The rider of the bike suffered serious leg injuries. He was now in a stable condition in Christchurch Hospital, police said.

The motorbike crashed into the back of a car waiting to turn right into Harleston Rd, police said.

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Both Ms McLeod and the rider were thrown from the bike in the crash.

It was believed Ms McLeod was hit by an oncoming car, and then flung underneath a van.

Her family were said to be "devastated at their sudden loss", and were being comforted by police and Victim Support, police said in a statement today.

Investigations into the crash were continuing.

Ms McLeod's death has been referred to the coroner.

The Queen's Birthday weekend road toll was five.