A couple travelling in a convoy got caught in a ''chain reaction'' crash in Dunedin yesterday.

University of Otago law and music student Latafale Auva'a, of South Auckland, was driving a Hyundai Sonata, which was hit from behind and shunted into her boyfriend Callum Lynch-Hine's Honda CRV.

''My car went under him,'' Auva'a said.

Lynch-Hines, of the North Shore, said he had asked Auva'a to follow him to the mechanic yesterday so she could then drop him at Leith Valley Presbyterian Church where he worked.

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He bought the Honda last week.

Auva'a has third-party insurance on her late-model Hyundai, which she expected would be written off.

''At least it went out in a blaze of glory.''

University of Otago student Tahlia Moir, of Roxburgh, said she was travelling south on State Highway 1 in Cumberland St and had stopped her Nissan Pulsar at the traffic lights at Museum Reserve.

She was waiting for the lights to change when Lynch-Hines' Honda CRV crashed into the back of her car about 9am.

Moir's car was the final to be hit in the ''chain reaction'' crash on the one-way stretch between Union Pl and Albany St.

It looked like a black Subaru Legacy hit the back of a red Hyundai Sonata, which hit the back of a blue Honda CRV, which hit Moir's Nissan.

The four-car pile-up blocked the left lane of the road, forcing traffic to converge into the right lane.

Auva'a said about 10 minutes after the crash, a car and a Kenworth logging truck collided at the next set of traffic lights further north on the same stretch of road.

A St John spokeswoman said no one was injured in the crashes.