A 50-year-old woman is in serious condition after a collision with a fully loaded concrete truck on State Highway 1 south of Whangarei.
The One Tree Point resident was taken to Whangarei Hospital by ambulance but when her condition deteriorated, she was flown to Auckland by the Northland Rescue helicopter.
Highway patrol Sergeant Lance Goulsbro said the crash, just after 9am yesterday, happened during a passing manoeuvre in the northbound lanes on Lookout Hill.
Initial police investigations revealed a car travelling north in the outside passing lane was clipped by the woman's vehicle, forcing it into the path of the oncoming concrete truck.
Tyre marks could be seen on the road where the truck veered off the road and into a ditch, where it remained upright.