Combination of factors cause crash
EMERGENCY services said Saturday's accident was a combination of wet weather, a change in road texture, and driver inexperience.
The P-plate driver was inexperienced, having only held a licence for six months, and the road's causeway had been flooded in recent rain.
Police said the driver's view of the causeway was obscured by long grass and the road had a change of texture just before the crash location.
Heavy showers had made the road slippery and water was flowing under the road through a drain.
Officers said the road curved to the left and sloped downwards to the floodway.
When police arrived, the car was two-thirds submerged under water and upside down.
The young female driver, 18, had been rescued by passers-by and had regained composure, appearing unhurt.
She told officers her licence was less than six months old and she was not familiar with the road.
She had applied the brakes as she approached the causeway and lost control. As the car spun, the wheels went over the drop and the car rolled on to its roof in long grass and water.
Police said witnesses almost immediately removed the driver from the vehicle before it sank.
Ambulance officers took the teen to hospital for observation and treatment for shock.
Police inspected the tyres on the upturned car and said there appeared to be sufficient tread.
They said the road was slippery in sections.
They said the crash was caused by a combination of factors.