Performance Evaluation of Selected Intersections in Addis Ababa with vissim software

The critical points within the urban road network usually considered as intersections, and their
performance evaluation provides valuable understanding and useful indication about the
performance of the city road network system. The signalized intersection capacity is more
significant because such intersections often control the capacity of the city streets to accommodate
traffic. Most of the intersections in Addis Ababa, are congested and operate in poor LOS during
peak hours, it is common to see congestion, long queues & delay at junctions. Accordingly, the
objective of the study is to evaluate the capacity and LOS of signalized intersections in Addis
Ababa, and based on the results of the analysis to draw conclusions and recommendations for
possible future considerations during junction design in the city. Four signalized intersections in
the city from major road corridors were selected to achieve this objective. From selected junctions
the required data was collected manually by the researcher using the necessary survey equipment
suitable for the study purpose. The capacity analysis throughout the study was performed based on
analytical method with some geometric elements using PTV vissim oftware program package, in
order to identify the level of service for the studied intersections. From studied intersections, Lebu
Mebrate haile ,Jemo Michael ,Jacros and Saris Abo the result of the study indicates that in the city
currently serving in poor condition of Level of Service (LOS) of “F” Thus, after carrying out
additional detail investigation and taking into consideration future traffic growth appropriate
improvement should be made by concerned bodies as soon as possible.