The Napier-Taupo Road has now reopened after a van plunged 6m down a bank early today.

Traffic was reduced to a single lane after the vehicle left the road about three kilometres north of Te Pohue at about 3.20am and ended up 6m down a bank, trapping two people inside.

The fire service had to cut free the driver and passenger.

A man and woman were taken to Hawke's Bay Hospital suffering moderate to severe injuries, he said.

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The cause of the crash is under investigation.

The New Zealand Transport Authority said State Highway 5 was now open to both directions of traffic.