State Highway 1 north of Taupō is blocked following a two car collision.

"The crash happened on the East Taupō Arterial, near Centennial Drive, at Rotokawa," says a police spokesperson.

"The crash was reported to Police about 2.20pm."

Four people are understood to have been injured - at least two seriously - and the Serious Crash Unit has been notified.

"One of the vehicles was towing a campervan."

Traffic management is in place and motorists should expect delays while the road is cleared.

At the scene?

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