A man is in a critical condition after a crash on State Highway 29 near McLaren Falls this morning.
A police media spokesperson says the crash happened at around 4.30am.
Motorists are being asked to take an alternative route and to expect some delays this morning.
"Emergency services attended the crash scene on the Kaimai Ranges, SH29, near McLaren Falls Road.
"A vehicle had broken down and was struck by another vehicle.
"Three other people have minor injuries as a result of this crash."
A reporter at the scene says two lanes are closed.
"Both uphill lanes are closed and one lane going down hill is open with traffic steady flowing past."
The Serious Crash Unit is investigating at the scene and motorists should expect some delays.
At the scene?
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