Grit, ice and speed were the likely factors which led to a car crash on Malaghans Rd on Saturday morning.
Greg Potter, of the Arrowtown Volunteer Fire Brigade, said the brigade was called at 8.20am and found the car upside down.
"You would have to put it down to ice - the grit trucks had been through, so it was probably a combination of grit and ice and speed," he said.
"It spun off the road and flipped on its roof."
Mr Potter said the two occupants escaped injury.
• A Queenstown man coming off the Remarkables skifield on Saturday afternoon was "very lucky" to have received only a laceration to his forehead when his car rolled off the access road.
St John Wakatipu ambulance team manager Alana Reid said the 34-year-old man was taken to Lakes District Hospital for treatment after his car rolled 15m off the side of the road.
He was very lucky to escape more serious injury, she said.
"To my knowledge, that's the first [crash of its kind] this season," she said.
