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Traffic safety meta-analysis of reversible lanes

机译：交通安全元分析可逆车道

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A meta-analysis was performed to review the potential effects of reversible lanes on traffic safety. A systematic review resulted in ten U.S studies, with 155 estimates of safety effects, that were selected for inclusion in the analysis. These studies employed either a simple before-after comparison or a cross-sectional comparison methodology. Study results were extracted by transforming the collision rates and frequencies of these studies into a log-odds ratio.The results of the meta-analysis suggest that the odds of a collision occurring are 30.9% higher for roads with reversible lanes when compared to roads without the treatment. The odds of a property-damage-only collision are predicted to be 16.6% higher, and injury collisions are predicted to be 34.9% higher with reversible lanes compared to no-treatment. The odds of a collision occurring during the peak period are expected to be 46.2% higher, while the odds of an off-peak period collision occurring are expected to be 12.8% higher. These results were statistically significant, with the exception of the off-peak period collision result.A meta-regression was performed, which regresses variables related to study type, collision type and operational characteristics of the study locations on the extracted log odds ratio. Peak period operations were positively and significantly correlated with an increase in crashes. Presence of left-turn restrictions and/or delineator/barrier were negatively correlated with crashes, whereas the presence of dynamic traffic control and static traffic control were positively correlated with crashes. Finally, cross sectional studies tend to find greater effects than before-after studies.
机译：进行了荟萃分析，以审查可逆车道对交通安全的潜在影响。系统审查导致了十四的研究，其中155例安全效应估计，被选中以纳入分析。这些研究采用简单的比较或横截面比较方法。通过将这些研究的碰撞速率和频率转化为对数量比来提取研究结果。元分析结果表明，与没有的道路相比，碰撞发生的几率为可逆车道的道路较高30.9％。治疗。仅损坏碰撞的几率预计较高为16.6％，预测伤害碰撞与无可逆转的泳道相比，损伤碰撞比无处理相比较高34.9％。在峰值期间发生的碰撞的几率预计将较高46.2％，而异峰周期碰撞的几率预计将增加12.8％。这些结果在统计上显着，除了偏振峰期碰撞结果之外。进行了荟萃回归，这对与研究位置的研究类型，碰撞类型和操作特性进行了回归的变量对提取的日志差率比。峰期操作呈积极性，并随着撞车的增加而显着相关。左转限制和/或描绘障碍/屏障的存在与崩溃负相关，而动态交通管制和静态流量控制的存在与崩溃呈正相关。最后，横截面研究倾向于发现比在后期之前的效果更大。

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