The Fire Service said because of the dangerous nature of the truck's cargo nearby homes were evacuated as a precaution.
Mike Brown, yard manager at the nearby Waimauku Landscape Supplies business, said: "I just heard a truck going up the hill, probably a little faster than normal. Next second, all I hear is a slide and then bang - a crash.
"I just thought: 'Oh sh*t, here we go again'.''
Brown said a truck and trailer crashed in the same spot about two weeks ago.
He said the driver in this morning's crash got out of the truck and Brown called emergency services.
"The ambulance turned up and then they quickly just left, so I'm guessing the driver was fine.''