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首页> 外文期刊>American Journal of Traffic and Transportation Engineering >Performance Evaluation of Grade Separation Within the Selected Major Intersection in Addis Ababa City
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Performance Evaluation of Grade Separation Within the Selected Major Intersection in Addis Ababa City

机译：亚的斯亚贝巴市选定主要路口内等级隔离的性能评估

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Urban City Traffic Management introduced various remedies to decongest traffic and to reduce the severity of accidents, such as providing traffic signal controls at the intersecting roads at different levels, or grade separating the traffic movement towards different directions. One type of grade separation is Road Underpass or Flyover. The construction of Road Underpass or Flyover poses some doubts whether it is effective or ineffective on the point of views of the travelers or motorists. It is for this reason that this research sought to evaluate the performance and effectiveness of Road Underpass structure on traffic flow at the major intersection, specifically the Wellosefer intersection in Addis Ababa City. The primary data used the existing traffic volume recorded between 7:00 AM - 6:00 PM from Monday to Friday. While the secondary data obtained from the Consulting Office "before" the improvement of Wellosefer intersection, including the previous study, which served as the control analysis for the research. From these data, the analyses provided results on vehicle travel time and delay for a case "before" and "after" improvement of the intersection. SIDRA Software was used to analyze the traffic conditions of the intersection. Based on the findings of the study, a case "before" Improvement of Wellosefer Unsignalized T-Intersection indicated with an average delay of vehicles of about 535.7 seconds, and a travel time of vehicles of about 574.7 seconds. On the other hand, a case "after" Improvement of Wellosefer intersection, three alternatives considered; such as 1) Signalized T-Intersection, 2) Roundabout, and 3) Road Underpass with Roundabout at the upper level. The results of the first alternative showed the Signalized T-intersection indicated an average delay and travel time of 344.3 seconds and 365.0 seconds, respectively. It means, there could be a reduction of 15.4% in average delay if signalized intersection implemented. The second alternative, a case of Roundabout using the same traffic data at current condition, the results indicated the motorists and commuters would be experiencing an average delay of about 355.8 seconds and average travel time of 390.0 seconds. The third alternative considering Road Underpass with Roundabout at the upper level, the results revealed that there was a significant reduction in average delay of vehicles of about 42% from the Unsignalized T-Intersection. Comparing this result with the Signalized intersection using the same traffic data, it showed that there was a significant decrease in average delay. Therefore, the findings of the study, a combination of Road Underpass and Roundabout at the upper level as in the case of Wellosefer intersection performed well than the other traffic control design alternatives.
机译：城市城市交通管理引入了各种补救措施，以缓解交通拥堵并减少事故的严重性，例如在相交道路的不同级别提供交通信号控制，或将交通流向不同方向分隔。坡道分离的一种类型是道路地下通道或天桥。从旅客或驾车者的角度来看，道路地下通道或天桥的建设是否有效还是有些疑问。因此，本研究试图评估主要交叉路口（特别是亚的斯亚贝巴市的Wellosefer交叉路口）道路地下通道结构对交通流的性能和有效性。主要数据使用的是周一至周五的7:00 AM-6:00 PM之间记录的现有流量。而从咨询办公室获得的二级数据则在“改善” Woseosefer交叉口之前（包括之前的研究）作为研究的控制分析。根据这些数据，分析提供了交叉路口“之前”和“之后”情况下车辆行驶时间和延迟的结果。使用SIDRA软件分析十字路口的交通状况。根据研究结果，“改进” Woseosefer无信号T型交叉路口“之前”的案例表明，车辆平均延迟时间约为535.7秒，车辆行驶时间约为574.7秒。另一方面，考虑“改善”威洛斯费尔交叉口后的情况，考虑了三种选择：例如1）信号灯T形交叉路口，2）回旋处和3）带有回旋处的高架道路地下通道。第一种选择的结果表明，信号T型交叉口的平均延迟和行驶时间分别为344.3秒和365.0秒。这意味着，如果实施信号交叉口，平均延迟可能会减少15.4％。第二种选择是在当前条件下使用相同交通数据的环形交叉路口的情况下，结果表明驾车者和通勤者将经历大约355.8秒的平均延迟和390.0秒的平均旅行时间。第三种选择是在较高处使用环岛的道路地下通道，结果表明，从无信号T型交叉路口起，车辆的平均延误明显减少了42％。将该结果与使用相同交通数据的信号交叉口进行比较，结果表明平均时延显着降低。因此，这项研究的结果比起其他交通控制设计方案，在威洛塞佛十字路口的情况下，结合了高架道路地下通道和环形交叉路口。

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