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PERMISSIVE DOUBLE LEFT TURNS: ARE THEY SAFE?

机译:允许的两次左转:它们是否安全?

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Permissive double left turns are used, on at least a limited basis, by many state and local agencies throughout the country. Despite the fact that this type of signal operation is currently in use in more than a quarter of the states, the existing research and policy guidance on permissive double lefts is very limited, and needs to be supplemented to address the interest indicated by this level of use.Safety and delay concerns need to be balanced in considering the use of permissive double lefts. The analysis performed as part of this study shows that accident rates are generally higher at permissive double lefts than at protected-only double lefts. However, while the difference in rates is smaller, the same is true of single lefts.
机译:全国许多州和地方机构至少在有限的范围内使用允许的左转弯。尽管目前有四分之一以上的州都在使用这种信号操作,但有关宽容双左的现有研究和政策指南非常有限,需要补充以解决此级别的信号所引起的兴趣。使用。 在考虑使用允许的双左时,需要权衡安全性和延误问题。作为这项研究的一部分进行的分析表明,在允许的双左手情况下,事故发生率通常高于仅在受保护的双左手情况下发生的事故率。但是,虽然利率差异较小,但单身左派也是如此。

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