公路设计例外对车辆事故频率和严重性影响的经验评估
Empirical assessment of the impact of highway design exceptions on the frequency and severity of vehicle accidents
摘要：
遵守标准化的公路设计标准被认为是确保道路安全的关键。然而，由于各种原因，出现了要求对标准设计准则提出例外并在审查后被接受的情况。本研究探讨了设计异常对印第安纳州事故严重程度和事故频率的影响。在道路现场的事故数据，没有设计的例外情况下，用于估计适当的统计模型的频率和严重程度的事故，在这些网站使用一些最新的统计进展与混合分布。建模过程的结果表明，经批准的设计例外的存在并没有对事故的平均频率或严重程度产生统计上的显著影响-这表明目前批准设计例外的程序已经足够严格，以避免不利的安全影响。
英文摘要：
Compliance to standardized highway design criteria is considered essential to ensure the roadway safety. However, for a variety of reasons, situations arise where exceptions to standard-design criteria are requested and accepted after review. This research explores the impact that design exceptions have on the accident severity and accident frequency in Indiana. Data on accidents at roadway sites with and without design exceptions are used to estimate appropriate statistical models for the frequency and severity accidents at these sites using some of the most recent statistical advances with mixing distributions. The results of the modeling process show that presence of approved design exceptions has not had a statistically significant effect on the average frequency or severity of accidents -- suggesting that current procedures for granting design exceptions have been sufficiently rigorous to avoid adverse safety impacts.
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