A logging truck and trailer has rolled on State highway 4, between Horopito and Erua, leaving one person injured and the road closed.
A police spokesperson said the highway is closed between Tohunga Junction and National Park. The collision was reported to emergency services around 2.50pm.
The driver of the truck was reported to have moderate injuries and had been taken to Whanganui Hospital, police said.
St John sent one ambulance to the crash.
Police said it was expected to take some time to clear the road of debris as heavy lifting equipment was required.