A woman believed to be aged in her 40s was seriously injured in a head-on collision at Cliftleigh, emergency services said on Wednesday afternoon.

Police and paramedics were called to Main Road about 5.15pm to reports two cars had collided.

The woman was trapped in her vehicle for an extended time, emergency services said, as a rescue vehicle was called in to help free her.

A spokesperson for the state's ambulance said she had suffered injuries to her legs, chest and abdominals and was facing imminent transport to hospital.

She was freed just before 6pm and taken to John Hunter Hospital in a serious but stable condition, the spokesperson said.

The other driver reportedly suffered minor injuries but did not need hospital treatment.

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