Three people have been injured after a head-on crash on SH16 just north of Helensville.
Police were called at around 6.20am this morning on the Kaipara Coast Highway.
Two cars travelling in opposite directions collided head-on at a bend in the road, just north of Helensville.
The car travelling south had one male driver who sustained serious injuries and the car travelling north had one female driver and a female passenger, were also seriously injured.
All three were taken by ambulance to Auckland Hospital.
A third car travelling north which was behind one of the cars involved swerved to avoid the crash and went into a ditch.
The driver of that car was not injured.
The Waitemata Serious Crash Unit is on the scene and the road is expected to remain closed for at least another hour.
Police say is too soon to say how the crash was caused and that will be form part of the Serious Crash Unit investigation.