A man and woman killed in a drink-drive crash last year would have died almost instantaneously, a coroner has ruled.
Robert Hilton Scott was convicted of two charges of careless driving causing death earlier this year, for crashing the car that killed his girlfriend Samantha Michelle Bradley, 19, and his close friend Jeremy Neil Johnson, 22.
He failed to negotiate a bend in the Hakataramea Highway and rolled down a bank and hit a tree around 11.30pm on August 17, 2013, after the trio and another friend had been drinking at a birthday party in Timaru.
Neither Mr Johnson or Ms Bradley, who were sitting in the back, were wearing seatbelts at the time. They both had alcohol in their system, with Mr Johnson also testing positive for cannabis.
Mr Johnson was thrown out of the Nissan Primera, suffering serious injuries to his head and chest, while Ms Bradley injured her face, head and brain, the coroner's report said.