Police stopped her vehicle in south Los Angeles because of a mechanical defect.

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According to Mr Pearson around 10% of all accidents on the island are either caused by, or contributed to, by a mechanical defect.

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There was no mechanical defect to explain the tragedy, but the inquest heard that the road surface was worn and was resurfaced a few weeks after the accident.

BBC: NEWS | UK | Wales | Fatal Christmas crash 'accidental'