It was a crash that ground the lower North Island to a halt and cost a 64-year-old woman her life. A giant truck, a "B-train", rolled on top of a small Mazda.
More than three years later, no one has been held responsible. 60 Minutes reporter Amanda Millar goes in search of answers.
Watch the video.
Producer: Eugene Bingham
Reporter: Amanda Millar
Camera: Belinda Walshe
Editor: Tamara Finau-Moir