Emergency services were called to two separate crashes involving single cars hitting power poles on State Highway 2 between Masterton and Carterton on the weekend.
The first crash happened around 3pm on Saturday.
A Toyota hatchback was travelling north along State Highway 2 when it veered across the road.
The car hit a ditch, rolled and went through a fence, according to a police spokesman.
He said it appeared the driver might have suffered from a medical condition, and sustained minor injuries in the crash.