Performance Evaluation of Major Intersection for Improvement of Traffic Safety and Efficiency in Shashemene Town

Intersections are one of the most crucial parts of urban transportation systems since they actively contribute to developing strategies to reduce traffic congestion. One of the major issues that nations around the world face is traffic congestion on roads and intersections. More than 90% of intersections on high-speed roads in developing countries have poor turning space, compared to 64% in developed countries. This study evaluates the performance of major intersections for improving traffic safety and efficiency in Shashemene Town. The objective of this study was to assess current traffic flow patterns, evaluate the effectiveness of existing traffic control measures, and propose potential improvements to enhance safety and efficiency at the selected major intersections. The scope of the study was limited to the three major intersections in Shashemene Town, such as Awasho Roundabout, Abosto Intersection, and Semaniya-Andi Intersection, with a focus on understanding the challenges faced in this urban context. The data were collected using a combination of traffic volume counts and user surveys during peak traffic hours. The SIDRA Intersection Version 8.0 software was employed to evaluate key performance indicators, including travel time, delay, travel speed, LOS, and V/C ratio. The analysis revealed significant congestion at the Awasho Roundabout, with an average travel speed of 35 Kph, a control delay of 24.1 s/veh, LOS C, and a V/C ratio of 0.81. The Abosto Intersection showed moderate delays with a delay of 34.1 s/veh, LOS D, and a V/C ratio of 0.98, while the Semaniya-Andi Intersection performed the best with a delay of 12.8 s/veh, LOS B, and a V/C ratio of 0.64. The findings indicate that while the Semaniya-Andi Intersection operates within acceptable performance levels, the Awasho Roundabout is severely congested, necessitating immediate interventions. To guide drivers, install clear and visible road markings, and ensure pedestrian safety. Installing well-marked pedestrian crossings improves traffic safety and efficiency of the roundabout as a short-term intervention. As a long-term improvement, redesigning the roundabout to accommodate higher traffic volumes and improve flow.