One woman has been seriously injured in a truck and car collision, north of Taupō.

A police media spokeswoman said police were called to the crash, on State Highway 5, shortly before 3.30pm.

"Initial reports suggest it is a car versus a truck and one person [was] trapped."

She said the crash was between Tram Rd and Tokomaru Rd.

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She said the woman driving the car had been freed and was in the back of an ambulance.

A spokeswoman for St John said there was one patient with serious injuries.

A Fire and Emergency New Zealand spokesman said the crash was about 10km north of Wairakei.

The injured woman was taken to Rotorua Hospital in the Greenlea rescue helicopter.