Senior Sergeant Anthony Bond, of Dunedin, said the incident involved three cars that were travelling uphill and collided nose to tail about 7.40am.
Because of poor visibility and inappropriate following distances, when the front car and second car slowed while travelling uphill, the third car crashed into the rear of the second, Snr Sgt Bond said.
The crash blocked the lane for about an hour and the driver of the third car was injured.
The incident was a timely reminder for motorists to drive to the conditions, as winter was coming and poor weather would continue, Snr Sgt Bond said.
A Hato Hone St John spokeswoman said one person with moderate injuries was taken to Dunedin Hospital.