UPDATED 3.35PM: State Highway 25 between Whitianga and Tairua is partially opened after emergency services freed an adult trapped in a car down a bank.

A Police spokesperson says the road is open, but has limited access. People travelling between Tairua and Whitianga should expect delays.

Emergency services were called to the scene on SH25, Whitianga Road, about 10 minutes north of Tairua at 12.45pm after the car carrying four adults and two children went down a bank.

One adult was trapped in the car and has since been taken to hospital with the five other passegners.

The spokesperson says the road is expected to re-open fully about 5.30pm once the serious crash unit has finished its examination of the crash.