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One lane of State Highway 1, just north of Waihola, was blocked after the incident this morning.
The car was on its side just off the south-bound lane, while the trailer ended up in a paddock. The road reopened early this afternoon.
Two people managed to get themselves out of the car.
An officer has confirmed no one was injured. "It looks a lot worse than it is."
St John ambulance staff left the scene just after 11.45am.