Dr Sivak and his colleague Brandon Schoettle studied data from a nationally representative sample of police-reported crashes in the US from 1988 to 2007.

西瓦克博士和他的同事布兰·顿顿·舒奥托研究了1988年到2007年警方报道的全美具有代表性的车祸案例资料。

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Dr Sivak and his colleague Brandon Schoettle studied data from a nationally representative sample of police-reported crashes in the US from 1988 to 2007.

西瓦克博士和他的同事布兰顿·舒奥托研究了1988年到2007年警方报道的全美具有代表性的车祸案例资料。

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Sivak said that the 14 percent drop in his index swamps the four percent increase in drivers over the period.

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