Rotorua Fire senior station officer Richard Anastasi said they had to cut the two people out of the car, and did so quickly.
He said they had moderate injuries and were very lucky.
An ambulance communications spokeswoman said the two people were taken to Rotorua Hospital's emergency department.
Rohit Bharti, manager of Waiotapu Tavern, said he saw the car spin around from inside.
"Since I have been here there have been so many accidents and they have put a stop sign up, but nothing is being done about the speed," he said.
"There is not a single day without at least five honks and close calls," he said.
In 2015, the New Zealand Transport Agency invested about $400,000 to improve safety on SH5 near Waiotapu.
The work, completed last April, involved installing left-turn deceleration lanes to help drivers identify where they needed to turn and to be able do so without impeding through traffic.
Street lighting was also improved.