A person has been injured in a car crash on a busy highway in the Waikato this afternoon.

Police, fire and ambulance staff were called to the Waikato Expressway, near the Cambridge on-ramp, just after 1pm.

There were reports that a car had rolled on the northbound side of the road.

"The vehicle was on its roof,'' a police spokeswoman said.

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One person suffered moderate injuries as a result, police said.

A tow truck was brought in to take the vehicle involved away as authorities worked to clear the area.