A helicopter has been called to rescue a driver in a car that has rolled down a bank at Mt Messenger, north of New Plymouth.
A police spokeswoman said the car went down a bank off Mokau Rd/SH3 near the northern side of the Mt Messenger tunnel.
The report came in around 5.20pm.
"It appears one person is involved, and a helicopter is responding," the spokeswoman said.
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"Fire and Emergency NZ are also on scene."
A St John spokeswoman said the ambulance service was notified at 5.19pm, sent one ambulance and one helicopter and transported one patient in a serious condition to Taranaki Base Hospital in New Plymouth.