A motorist who plunged 30 metres down a cliff near Havelock, Marlborough has been transported to Nelson Hospital with serious injuries.
The incident took place on State Highway 6 near Wilsons Rd, Havelock, around 2.30pm.
One person was treated for injuries following the crash which also resulted in the temporary closure of the northbound lane of State Highway 6.
It was closed until around 5pm when the NZ Transport Agency reported on Twitter until the crash had been cleared.
A police spokeswoman told the Herald it was believed there was only one motorist inside the vehicle when it went off the cliff.