State Highway One is closed north of Auckland after a crash.
Police say they were called to the scene near Schollum Access Road, Warkworth, around 5pm.
One person was trapped in a vehicle and has been cut free.
A helicopter is at the scene now and the person will be transported to hospital in a critical condition.
Diversions are in place at the intersection of SH1 and Moir Hill Road, and SH1 and Woodcocks Road.
The road is closed in both directions while the Serious Crash Unit investigates.
Police advise motorists to delay travel where possible and expect delays.
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