Bikila Tekelu (PhD)Samuel Endale2024-10-282024-10-282024-06https://etd.aau.edu.et/handle/123456789/3511One of the most prevalent issues with urban transportation systems is traffic congestion. When there is a disruption in the regular flow of traffic, it leads to a decrease in speed, a delay in travel, and a substandard quality of service, this is known as traffic congestion. Depending on the causes, traffic congestion can either be recurrent or non-recurrent. Recurrent congestion is brought on by transient signal changes, capacity violations, and excessive traffic demand. On the other side, unusual events like work zones, severe weather, and other occurrences could cause non-recurring congestion. Numerous methods for evaluating traffic congestion have been devised, taking into account various factors such as speed, travel duration, frequency of delays, quality of service, and other congestion indicators. The level of service method and travel time-based measurements, which are the two categories into which the already existing congestion measures were divided, then examined within this research. The road segment Mexico square – German roundabout was chosen from the city’s core area and three road sections were selected from this segment to achieve the stated objective. The relevant data was manually collected by the researcher from selected segments, utilizing equipment appropriate for the study's objectives. The results showed the travel time based measures showed variations in the congestion state while indicating a similar congestion trend during peak and Off-peak hour for the Africa union – Pushkin square and Mekanisa Abo – Mekanisa road sections while showing a uniform congestion state for the Mekanisa – German Roundabout Road section. The capacity for the level of service was modeled using three traffic flow models, the Greenshields, Greenberg and Underwood model. The result indicates the underwood model better explained the data compared to the other two models. And, the advantages and disadvantages of the measures used have been discussed from the results.en-USTraffic CongestionGerman RoundaboutRoad SegmentThesis