The crash has caused significant disruption, with Google Maps showing the 14km journey from Ramarama to Takanini taking more than 40 minutes around 7.30am.
Meanwhile, a another crash on SH16 has blocked the left eastbound lane before Lincoln Rd, slowing drivers heading into the city.
The crash happened just before 7am and was cleared around 7.50am, but NZTA is still warning drivers to expect delays.
The trip from Helensville to the city was taking commuters more than two hours according to the NZTA website.
Just before 8am, commuters heading east through the area could expect to add at least 20 minutes to their journey, according to the NZTA’s journey planner.