A man is in critical condition after a two car crash on State Highway 2 in the Hauraki District, police said.

Both lanes of the highway are blocked and covered in oil near the suburb of Netherton.

Diversions are in place directing all north-bound traffic to turn right into Captain Cook Road. South-bound traffic is being directed left into Wharepoa Road.

Police anticipate traffic flow to resume to normal in the next hour.

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The man will be flown to Waikato hospital for treatment to his hip.

- HERALD ONLINE