A Royal Navy veteran rushed to the woman’s aid after her Toyota Yaris was left upside-down in an accident in Elettra Avenue, Waterlooville.
Police, firefighters and paramedics were called just after 11am.
Van driver and ex-serviceman, James Castley, rushed to help the woman after witnessing the accident.
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'I was getting out of my van when I heard a loud bang and saw the car coming through the fence and towards me,' said Mr Castley, 58.
‘It clipped one of the cars in the car park and flipped on to its side.
‘I ran across and the first thing I asked was whether there were any kids in the car. She said no.
'I told her to switch the engine off because of the risk of fire and I then managed to drag her out from the vehicle.
‘The laces on her shoe were still trapped and so I ran to my van and got some scissors to cut her free.'
As James quickly got the woman to safety, he asked other passers-by to call the emergency services.
He said: 'Once I got her free I helped her to stand up. She was in shock but didn't seem seriously injured.
‘She was fortunate that the car flipped into a parking space and not onto another car.'
The woman, believed to be in her 20s, has been taken to hospital and the car has been turned over.
Eyewitness Jordan Folkard, 24, described the aftermath of the crash as 'shocking’.
‘The car was almost perfectly in a space between two other cars, but one was damaged because it was hit by the back end of the flipped car,' Jordan said.
‘It looks as if it has gone through the wooden rails around the car park.'
Pictures from the scene show glass from the car’s broken back window strewn across the tarmac, with snapped wooden fence posts under its front end.
The News has contacted Hampshire Constabulary and South Central Ambulance Service for more information.