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A longitudinal analysis of the effectiveness of California's ban on cellphone use while driving

机译：纵向分析加利福尼亚州禁止在开车时使用手机的有效性

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摘要

Cellphone use while driving is an increasingly serious threat for traffic safety and is prohibited in many jurisdictions. In California, the use of handheld cellphones while driving has been prohibited since July 1, 2008. Using interrupted time series analysis, this study explores the effectiveness of the ban by specifically analyzing the crashes caused by cellphone usage in California from 2002 to 2014. These crashes were thought to be able to reflect the role of the ban more accurately than total crashes. The ban was found effective in reducing the cellphone usage caused crashes in terms of both crash frequency and crash proportion. The study also confirms that crashes caused by cellphone use produce more severe outcomes than other crashes. These findings show that the ban on handheld cellphone use while driving plays an important role for improving traffic safety in California. In addition, it is found that the ban motivates drivers to switch from handheld cellphones to hands-free cellphones, but in terms of crash severity, hands free cellphone usage and handheld cellphone usage do not show significant differences. These findings support a complete ban on cellphone use while driving not just a prohibition of handheld cellphone use. The study results are expected to provide new insights for future policy making related to cellphone use while driving.
机译：驾驶中使用手机对交通安全构成越来越严重的威胁，并且在许多辖区都被禁止。在加利福尼亚州，自2008年7月1日起禁止在开车时使用手持手机。通过中断时间序列分析，本研究通过专门分析2002年至2014年加利福尼亚州因使用手机而导致的交通事故来探索该禁令的有效性。人们认为撞车事故比完全撞车事故能更准确地反映出禁令的作用。这项禁令被发现可以有效地减少因撞车频率和撞车比例造成的撞车事故。该研究还证实，由手机使用引起的崩溃比其他崩溃产生的后果更为严重。这些发现表明，禁止在驾驶时使用手持手机对改善加利福尼亚州的交通安全起着重要作用。另外，发现该禁令促使驾驶员从手持式手机切换到免提手机，但是就碰撞严重程度而言，免提手机的使用与手持式手机的使用没有显着差异。这些发现支持完全禁止手机使用，而不仅仅是禁止手持手机使用。预期研究结果将为与驾驶时使用手机有关的未来政策制定提供新见解。

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