Transportation is a crucial element that plays a pivotal role in the economic and social development of any society. In Ethiopia, road transport is the primary means of transportation, and it is fraught with several challenges characterized by a low level of reliability. Atlas Cross Road is a vital intersection located in Addis Ababa, which experiences high traffic density, with up to 600 meters of maximum traffic stretches. The slow movement of vehicles on these four intersections contributes to environmental pollution through gas emissions, and the economic losses measured in fuel cost and time are substantial. To assess the traffic situation at Atlas Cross Road, data was collected from the Bole Sub City transport bureau and through field observation. MS Excel software was used to enter, compile, and analyze the data, while Monte Carlo modeling aided in factor analysis and the development of a conceptual model. Additionally, agent-based simulation software was utilized to develop a traffic flow model. The study revealed that the Kasanchis and Bole Brass lines experience the highest traffic flow, making them the most congested lines at Atlas Cross Road when compared to Bole Rwanda and Wuha Limat. The research results indicate a loss of approximately 236,324.9925 birr per hour at Atlas Cross Road, highlighting a significant economic loss due to traffic congestion at a single intersection in the city. Monte Carlo modeling was an effective tool in solving the most severe issue of the Bole Atlas Road conjunction area.