A truck driver has been critically injured in a serious crash on State Highway 23, in Waikato.
Emergency services were called to the area - between Te Pahū and Waitetuna Valley Rd - about 8.30am after reports of a crash.
A northern fire communications spokeswoman said they were told the truck had rolled.
Four fire trucks were called out and the driver was extricated just before 9.30am.
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St John said one person was taken to Waikato Hospital in a critical condition.
Transport authorities closed part of the road just before 9am.
The latest update, released at 9.40am, said: "Due to the serious nature of this crash, this section of SH23 (to/from Raglan) is likely to remain closed for quite some time today."
Motorists are being told to allow extra time for the detour.