No one was injured when a man lost control of his vehicle on State Highway 3 near Turakina on Monday afternoon.
The man told police he had suffered a medical event which led to his car rolling and stopping on a fence about 500 metres from Dudding Lake.
No other vehicles were involved in the accident that occurred at about 3.10pm.
"He was going north, he's drifted into a ditch and then come back across and hit the side," Constable Brett Parkinson said.
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"There's been one roll, but luckily no one was coming. It was very minor in the scheme of things."
The crash occurred just before a three-car crash on the Whanganui City Bridge in which nobody was hurt, but a tow truck was required to remove vehicles.