Police have named the three people killed in separate road crashes within 48 hours in Canterbury.

Aliielua Fesili Salaivao, 38, was the only occupant of a van that had a collision with a south-bound car on Durham St, Christchurch, on Saturday night.

On Sunday night, Trish Anne Beets, 44, was the front seat passenger in a car struck by a bus at the intersection of Kilmore and Columbo streets.

And yesterday afternoon, Steven Charles Skinner, 45, was the front seat passenger of a vehicle that rolled on SH8 near Lake Pukaki.

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The deaths have been referred to the coroner and victim support are working with the families.

Police say two men from the south-bound car in Saturday's crash were in a critical condition in hospital, while two women from yesterday's crash were in hospital in a stable condition.

Police investigations into the crashes continue.