The Palmerston North Rescue Helicopter has been called to two incidents involving quad bikes in two days.
The first incident occurred at Tangimoana Beach on Monday evening when a 13-year-old girl came off her quad bike after hitting a large piece of driftwood.
A hospital spokeswoman said the teen was currently in Palmerston North Hospital's intensive care unit, in a stable condition.
The second incident occurred yesterday just before 4pm. A 66-year-old man near Marton rolled his quad bike, suffering neck and chest injuries.
He is currently in Whanganui Hospital in a serious condition.