标题： 速度限制对印第安纳州道路安全的影响 显示英文标题

标题： Influence of Speed Limit on Roadway Safety in Indiana

摘要： 速度限制对道路安全的影响是一个极其重要的社会问题，在印第安纳州和全国范围内都存在广泛的争论。 每年印第安纳州有大约800至900人死亡，数千人受伤，交通事故给该州带来了巨大的社会和经济负担。 然而，高速公路和其他道路上的限速经常被个别驾驶员超过，他们试图在安全性和通行效率（速度）之间取得平衡。 这项研究探讨了速度限制与道路安全之间的关系。 具体来说，研究关注的是公布的速度限制对事故原因和严重程度的影响。 研究中使用了来自印第安纳州电子车辆碰撞记录系统的个体事故数据，并为所有道路类型的各类事故的原因和严重程度估计了适当的统计模型。 建模结果表明，速度限制对所有道路上与超速相关的事故原因没有统计学上显著的负面影响，但通常会增加除高速公路以外的大多数道路上事故的严重程度（高速公路事故的严重程度不受速度限制的影响）。 我们的研究结果或许可以通过帮助印第安纳州交通部确定该州最优的速度限制政策来挽救生命和节省出行时间。 显示英文摘要

摘要： The influence of speed limits on roadway safety is an extremely important social issue and is subject to an extensive debate in the State of Indiana and nationwide. With around 800-900 fatalities and thousands of injuries annually in Indiana, traffic accidents place an incredible social and economic burden on the state. Still, speed limits posted on highways and other roads are routinely exceeded as individual drivers try to balance safety and mobility (speed). This research explores the relationship between speed limits and roadway safety. Namely, the research focuses on the influence of the posted speed limit on the causation and severity of accidents. Data on individual accidents from the Indiana Electronic Vehicle Crash Record System is used in the research, and appropriate statistical models are estimated for causation and severity of different types of accidents on all road classes. The results of the modeling show that speed limits do not have a statistically significant adverse effect on unsafe-speed-related causation of accidents on all roads, but generally increase the severity of accidents on the majority of roads other than highways (the accident severity on highways is unaffected by speed limits). Our findings can perhaps save both lives and travel time by helping the Indiana Department of Transportation determine optimal speed limit policies in the state.