A motorcyclist is critically hurt after crashing into a fence on State Highway 2 at Mangatawhiri, in Waikato.

The crash happened near the intersection with the highway and Mangatawhiri Rd, around 12.30pm.

St John says one person has been taken to Waikato Hospital in a critical condition.

State Highway 2 is now open to one lane but there is congestion.

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The NZ Transport Agency is urging drivers to follow the instructions of emergency services and watch their speed.