Two people have been transported to hospital after suffering moderate injuries following the Oakleigh crash.
Traffic was backed up several kilometres in both directions after the two-vehicle collision, which occurred after 6am.
A large truck was blocking the road for some time, police said.
Motorists were advised to avoid travelling on State Highway 1 between the North Mangapai Intersection and Mata.
It had caused “major delays”, police said.
Brodie Stone covers crime and emergency for the Northern Advocate. She has spent most of her life in Whangārei and is passionate about delving into issues that matter to Northlanders and beyond.