Safety performance evaluation of left-side off-ramps at freeway diverge areas
Safety performance evaluation of left-side off-ramps at freeway diverge areas
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DOI：
10.1016/j.aap.2010.08.019
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发表时间：
2011-05-01
影响因子：
5.9
通讯作者：
Hsu, Peter
中科院分区：
文献类型：
--
作者：
Chen, Hongyun;Zhou, Huaguo;Hsu, Peter
通过比较高速公路分叉口左侧出口匝道和右侧出口匝道的安全性能，评价了左侧出口匝道的安全性能。共收集了佛罗里达州11个左侧和63个类似右侧分叉区域的撞车记录。基于收集到的数据，本研究对交通冲突进行了研究，并对撞车事故进行了横断面比较。识别并统计了四种类型的交通冲突。坡道附近的平均冲突率约为每1000辆冲突车辆中有10辆。对左侧出口匝道和右侧出口匝道的碰撞数据分别按两种出口匝道类型进行了比较：单车道出口和带有可选车道的双车道出口。比较表明，左侧出坡道确实有更高的平均撞车次数、撞车率和严重撞车百分比，但只有在10%的严重撞车水平上，差异才在统计上显著。开发了一个单车道出口的撞车预测模型，以确定导致选定高速公路路段的撞车事故的因素。这一结论与横断面比较一致。希望本文的研究能帮助工程技术人员更好地了解高速公路分叉口左侧下匝道的情况，选择合适的对策和实用的设计方案。(C)2010爱思唯尔有限公司。保留所有权利。
The safety performance of left-side off-ramps was evaluated by comparing that of right-side off-ramps at freeway diverge areas. Crash records at a total of 11 left-side and 63 similar right-side diverge areas in Florida were collected. Based on the data collected, the traffic conflict study and the cross-sectional comparison of crashes were conducted in this study. Four types of traffic conflicts were identified and counted. The average conflict rates near the ramp area were found to be approximately 10 per 1000 conflicting vehicles. Crash data were compared for the left-side off-ramps with right-side off-ramps by two exit ramp types: one-lane exit and two-lane exit with an optional lane, respectively. The comparisons indicate that the left-side off-ramp did have higher average crash counts, crash rate and percentage of severe crashes, but the difference is only statistically significant for the severe crashes at a 10% level. A crash prediction model for one-lane exit was developed to identify the factors that contribute to the crashes that have been reported for selected freeway segments. The conclusion is consistent with cross-sectional comparison. It is expected that this study could help engineers have a better understanding of left-side off-ramps at freeway diverge area and select the appropriate countermeasures and practical designs. (C) 2010 Elsevier Ltd. All rights reserved.