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Item ANALYSIS OF THE EFFECTS OF THREE WHEELERS ON PERFORMANCE MEASUREMENT PARAMETERS OF INTERSECTIONS: A CASE STUDY: ROUNDABOUTS AND SIGNALIZED INTERSECTIONS IN HOSSANA CITY(Hawassa Unversity, 2020-10-18) DAWIT DAMISSIE ERGICHOTraffic intersections are complex locations on highways. This is because vehicles moving in different direction want to occupy same space at the same time. Traffic volume is one of the variables that have the biggest effect on intersection performances. The traffic volume of Menharya and Maryam signalized intersections, Bezabh Petros and Eyerusalem roundabouts at Hosanna city is highly occupied by three wheelers. So it is vital to study the effects of three wheelers on performance measurement parameters of intersections. The other purposes of the study were, analysis of existing intersection performances, evaluation of the consequences of three wheelers with performance parameters and comparing the performance change of intersections by replacing three wheelers with a minibus. All data were collected by using video camera for traffic data and measuring tape for geometric data. By taking peak hour volume, the performance measurement parameters of intersections were done using HCM 2010 methodologies incorporated in SIDRA Intersection Software 5.1. The effects of three wheelers on intersection performances were evaluated by excluding three wheelers from analysis and by comparing each performance parameter changes with and without three wheelers. By replacing three wheelers with minibus of 12 seats, the performance changes of intersections were evaluated and compared well. From the result of the study, Menharya signalized intersection is operating above its capacity because, the degree of saturation of this intersection is 1.374 which is greater than one and Maryam signalized intersection also shows congested condition with degree of saturation 0.852. 70.5% cause for delay, 85.5% cause for a degree of saturation, and 93.8% cause for the queue distance of Menharya signalized intersection is the presence of three wheelers. In the same manner for Maryam signalized intersection, 17.1% cause of delay. 82.2% cause of degree of saturation, and 90.7% cause of queue length is three wheeler's presence. The performances of both roundabouts are also affected highly due to presence of three wheelers. For Menharya signalized intersection, 54.1% Average delay, 31.7% degree of saturation and 59.5% queue distance, For Maryam signalized intersection, 19.3% Average delay, 32.4% degree of saturation and 45.6% queue distance is improved when Three wheelers replaced by minibus.Item ANALYSIS OF THE EFFECTS OF THREE WHEELERS ON PERFORMANCE MEASUREMENT PARAMETERS OF INTERSECTIONS: A CASE STUDY: ROUNDABOUTS AND SIGNALIZED INTERSECTIONS IN HOSSANA CITY(Hawassa Inversity, 2020-07-17) DAWIT DAMISSIE ERGICHOABSTRACT Traffic intersections are complex locations on highways. This is because vehicles moving in different direction want to occupy same space at the same time. Traffic volume is one of the variables that have the biggest effect on intersection performances. The traffic volume of Menharya and Maryam signalized intersections, Bezabh Petros and Eyerusalem roundabouts at Hosanna city is highly occupied by three wheelers. So it is vital to study the effects of three wheelers on performance measurement parameters of intersections. The other purposes of the study were, analysis of existing intersection performances, evaluation of the consequences of three wheelers with performance parameters and comparing the performance change of intersections by replacing three wheelers with a minibus. All data were collected by using video camera for traffic data and measuring tape for geometric data. By taking peak hour volume, the performance measurement parameters of intersections were done using HCM 2010 methodologies incorporated in SIDRA Intersection Software 5.1. The effects of three wheelers on intersection performances were evaluated by excluding three wheelers from analysis and by comparing each performance parameter changes with and without three wheelers. By replacing three wheelers with minibus of 12 seats, the performance changes of intersections were evaluated and compared well. From the result of the study, Menharya signalized intersection is operating above its capacity because, the degree of saturation of this intersection is 1.374 which is greater than one and Maryam signalized intersection also shows congested condition with degree of saturation 0.852. 70.5% cause for delay, 85.5% cause for a degree of saturation, and 93.8% cause for the queue distance of Menharya signalized intersection is the presence of three wheelers. In the same manner for Maryam signalized intersection, 17.1% cause of delay. 82.2% cause of degree of saturation, and 90.7% cause of queue length is three wheeler's presence. The performances of both roundabouts are also affected highly due to presence of three wheelers. For Menharya signalized intersection, 54.1% Average delay, 31.7% degree of saturation and 59.5% queue distance, For Maryam signalized intersection, 19.3% Average delay, 32.4% degree of saturation and 45.6% queue distance is improved when Three wheelers replaced by minibuItem EVALUATING THE TRAFFIC OPERATIONAL PERFORMANCE IN ADDIS ABABA: A CASE OF MEGENAGNA TO AYAT ROAD CORRIDOR(Hawassa University, 2021-10-17) BETHLEHEM TILAHUN GEBREPoor traffic performance is a major problem in many countries affecting urban traffic sustainable development at present. It has a significant effect on social, economic, and environmental. Due to economic development and urbanization, transport in Addis Ababa has faced traffic congestion problems. This paper presents a study on the evaluation of operational performance of traffic in Addis Ababa in the case of the Megenagna to Ayat road network by addressing the factors that cause traffic congestions. LOS, average delay, and degree of saturation were quantified for three roundabouts using SIDRA software to analyze the traffic conditions in the study area. And Levels of service for three road segments were quantified using HCM 2010. A multiple regression analysis using SPSS was applied to quantify the factors that cause congestion on the performance of the road network based on questionnaire and field data. From the analysis, average speed of Ayat to Yetebaberute, Yetebaberute to Sahilitmiheret, Sahilitmiheret to Megenagna road segments were 11.6km/hr, 6.3km/hr & 5.45km/hr respectively and it was 30.08%, 26.14% & 22.59% of the free flow speed respectively. The LOS of these three road segments was F, and the traveler perception score was greater than 5, indicating drivers perceived the worst service. And for the three roundabouts i.e., Sahilitmiheret, Yetebaberute, and Ayat roundabouts, the overall LOS was F, so the degree of saturation is greater than 1 with the overall average delay of 405.20sec, 211sec and 310.2sec, respectively. The results from SIDRA software indicated that the roundabouts are providing traffic service above their capacity during the peak hour. From the SPSS result of the mean-variance results are significant at 0.05(p-0.05), which means that the factors caused traffic congestion in the study area. The regression model developed with R2 of 0.985, which is greater than 0.7, which shows the model was reliable. Based on the result of the study, the roundabouts were over congested; their operational characteristics were unsatisfactory, serving beyond their capacity & at a poor level of service. And the roundabouts contribute significant effect for the performance of the segments. The performance of the road network was poor and cause significant delay for the user. The factors that contribute for the poor traffic performance in the study area were significant to cause congestion.