The southbound detour was through SH15 and Marsden Point Rd, with motorists needing to allow a bit of extra time for the travel.
A witness described the truck as a transporter with a rock crusher onboard.
The State Highway 1/Port Marsden Highway is notorious for crashes, with traffic heading to NorthPort intersecting with vehicles travelling between Whangārei and Auckland.
Denise Piper is a news reporter for the Northern Advocate, focusing on health and business. She has more than 20 years in journalism and is passionate about covering stories that make a difference.