Capacity Evaluation Of Roundabout And Signalized Junctions In Addis Ababa

Intersections are usually considered as the critical points within the urban road network andrnthe evaluation of their performance provides valuable understanding and useful indicationrnabout the performance of the city road network system. The capacity of signalized andrnroundabout intersection is of more significant because such intersections often control thernability of the city streets to accommodate traffic.rnIn Addis Ababa, most of the intersections are congested and operate in poor LOS. Duringrnpeak hours, it is common to see congestion, long queues & delay at junctions. Accordingly,rnthe objective of the study is to evaluate the capacity and LOS of roundabout and signalizedrnintersections in Addis Ababa, and based on the results of the analysis to draw conclusionsrnand recommendations for possible future considerations during junction design in the city.rnTo achieve this objective, four roundabout and two signalized intersections in the city fromrnmajor road corridors were selected.rnThe required data was collected from selected junctions manually by the researcher usingrnthe necessary survey equipment suitable for the study purpose. The capacity analysisrnthroughout the study was performed based on analytical method with some geometric elementsrnusing SIDRA Software program package, in order to identify the level of service forrnthe studied intersections.rnThe result of this study indicates that the studied intersections Gerji-Imperial, Bole-rnMdihanialem, Teklehaymanot, Ayer-Tena, Legehar and Post-Office in the city currentlyrnserving in poor condition of Level of Service (LOS) of “F” except Post-Office intersectionrnwhich has LOS of “E”. Thus, after carrying out additional detail investigation and takingrninto consideration future traffic growth appropriate improvement should be made by concernedrnbodies as soon as possible.

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