Evaluation of Freeway Acceleration Lane Length Adequacy Based on Driving Behavior of Elderly Drivers

A. Jung, Jieun Ko, C. Oh
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引用次数: 2

Abstract

Elderly drivers have rapidly grown in the road transportation systems. One of the significant issues associated with elderly drivers is that the performance of perception and reaction contributing to the driving skill and capability is comparatively lower than that of drivers of different ages. In particular, the merging situations frequently occurring at the freeway on-ramp area lead to greater workload for elderly drivers and resultingly higher risk of crash occurrence. From the traffic safety perspective, determining proper acceleration lane length, therefore, is of keen interest because the physical ability of elderly drivers significantly influences whether or not the lane change is safe. This study evaluated acceleration lane length using VISSIM microscopic traffic simulation tool based on the consideration of the increase in elderly drivers. Results showed that approximately 370 meter length is proper in terms of accommodating unsafe merging events at the current rate of elderly drivers, 10%. In addition, it was identified that 415 meter was appropriate under a scenario with 20% of elderly drivers. The outcome of this study would be useful in updating road design guidelines reflecting the characteristics of elderly drivers.
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基于老年驾驶员驾驶行为的高速公路加速车道长度充分性评价
老年司机在公路交通系统中迅速增加。与老年驾驶员相关的一个重要问题是,对驾驶技术和能力有贡献的感知和反应表现相对于不同年龄的驾驶员较低。特别是高速公路入口匝道区域频繁发生的合流情况,给老年驾驶员带来了更大的工作量,导致事故发生的风险更高。因此,从交通安全的角度来看,确定适当的加速车道长度是一个非常重要的问题,因为老年驾驶员的身体能力会对变道是否安全产生重大影响。本研究在考虑老年驾驶员增加的基础上,利用VISSIM微观交通模拟工具对加速车道长度进行评估。结果表明,以目前老年驾驶员的比例(10%)来看,370米左右的长度是适合容纳不安全合并事件的。此外,在老年司机占20%的情况下,415米是合适的。这项研究的结果将有助于更新道路设计指引,以反映老年司机的特点。
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