A car had slid down a bank and landed on its roof in Horohoro, a reporter at the scene said.
A police spokeswoman said the driver was out of the car with the ambulance and had no injuries.
Police are still investigating the cause.
Emergency services are on their way to a crash on State Highway 30.
A police spokeswoman said the crash happened about 8.40am in Horohoro but she didn't know what vehicles were involved.
More to come.