背景:右转车道(RTL)撞车是美国十字路口撞车的主要原因之一。不幸的是,缺乏深入了解RTL几何设计因素对碰撞频率的影响阻碍了RTL安全性能的提高。
方法:以2013年至2016年印第安纳州十个县的撞车数据为案例研究,本研究调查了基于多源的RTL几何构型的安全性能。我们引入地理和时间加权负二项模型(GTWNBR)来捕获崩溃中的空间和时间不稳定性。
结果:结果表明,RTL几何设计因素对碰撞频率的影响在空间和时间之间存在显着差异。通过将估计的参数与道路类别相关联,可以从全州和多年的碰撞分析中获得几个关键见解,地方,和县。
结论:首先,RTL的长度,宽度,转弯半径,与其他因素相比,交通回旋处的分期具有更高的时空异质性。第二,RTL几何因素的影响在空间和时间上差异很大。与农村地区相比,自行车和行人车道的存在更有可能增加城市地区的撞车事故,尤其是在夜间。第三,与共享RTL相比,独占RTL降低了崩溃频率,与其他道路类别相比,独家RTL更有可能增加县道上RTL的撞车事故。增加RTL的转弯半径和减少RTL的长度更有可能在县道上比在其他道路类别上促进RTL的碰撞。
结论:这些见解为提高RTL和交叉路口的几何构型的安全性能提供了至关重要的指导。
Right-turn lane (RTL) crashes are among the key contributors to intersection crashes in the US. Unfortunately, the lack of deep insights into understanding the effects of RTL geometric design factors on crash frequency impedes improving RTL safety performance.
Taking the crash data in ten counties in
Indiana state from 2013 to 2016 as a case study, this study investigates the safety performance of RTL geometric configuration based on multi-sources. We introduce the geographically and temporally weighted negative binomial model (GTWNBR) to capture the space and time instability in crashes.
The results show that the impacts of RTL geometric design factors on crash frequency vary significantly among space and time. Several key insights can be obtained from the state-wide and multi-years crash analysis by associating the estimated parameters with road classes, localities, and counties.
First, the RTL\'s length, width, turning radius, and the installments of traffic roundabouts present higher spatiotemporal heterogeneity than other factors in modeling the crash frequency. Second, the effects of RTL\'s geometric factors vary significantly across space and time. The presence of bicycle and pedestrian lanes is more likely to increase crashes in urban areas than in rural ones, especially at nighttime. Third, while exclusive RTLs decrease the crash frequency compared to the shared RTLs, the exclusive RTLs are more likely to increase the crashes for RTLs on the county road than on other road classes. Increasing RTL\'s turning radius and decreasing RTL\'s length is more likely to promote crashes for RTLs on county roads than on other road classes.
The insights provide vital guidance to improve the safety performance of geometric configuration for RTLs and intersections.