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Evaluation of Operational Performance of Signalized Intersections of Jimma Town Using SIDRA Intersection Software

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dc.contributor.author Eyob Deneke
dc.contributor.author Jemal J. Mohammed
dc.contributor.author Gutema Wakjira
dc.date.accessioned 2023-10-05T07:16:16Z
dc.date.available 2023-10-05T07:16:16Z
dc.date.issued 2023-07
dc.identifier.uri https://repository.ju.edu.et//handle/123456789/8504
dc.description.abstract Intersections play a significant role in the road network, where traffic flowing in different directions crosses each other. The traffic flow at signalized intersections is more complex under heterogeneous traffic flow characteristics. Traffic-signal controls are commonly used in several at-grade junctions in urban areas to maximize traffic efficiency and safety by separating traffic movements in time. Traffic congestion and excessive delays at intersections is increasingly becoming a severe problem in developing countries than in the developed world. The objective of this research was to assess the operational performance of selected signalized intersections in Jimma Town. Traffic congestion and delays that cause poor traffic performance have negative impacts on economic productivity, environmental quality, and safety. The signalized intersections at Jimma Town are experiencing the same scenario. For the objective to be met, the four congested major intersections (Merkato, Menaharya, Faid Adebabay and Menafesha) were selected for the study. The traffic data on all approaches to the intersections was collected by a video camera during the most congested days of the week (Tuesday, Thursday and Saturday). The traffic volume obtained in different classes of a vehicle has been converted to a uniform vehicle fleet by the passenger car unit factor. Additionally, the geometric data for the selected intersections were measured, and signal cycle time and phase sequence were recorded at the time of field data collection. Data analysis and processing were performed using SIDRA intersection software to determine the traffic flow condition at the intersection. The performance measures used to evaluate the intersections were the average delay, degree of saturation, queue length, capacity and Level of service at the intersection were interpreted. Based on the findings, all intersections are serving in poor condition with a level of service F, v/c ratio greater than 1.0 and the average delay experienced was 338.9s for Merkato, 385.7s for Menahariya, 251.8s for Faid Adebabay and 295.3s for the Menafesha intersection. Based on sensitivity analysis, base saturation has reduced delay by 20–23%. Heavy vehicle restriction reduces delays by 8–20% for all intersections. Lastly, a basic saturation flow study, heavy vehicle restrictions and a regular traffic volume count database are the major recommendations forwarded en_US
dc.language.iso en_US en_US
dc.subject Capacity, Delay, Heterogeneous traffic, Intersection Performance, Level of Service, Signalized Intersection en_US
dc.title Evaluation of Operational Performance of Signalized Intersections of Jimma Town Using SIDRA Intersection Software en_US
dc.type Thesis en_US


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