Performance Evaluation of a Four-Legged Signalized Intersection with Variable Traffic Flow Dynamics

The rapid growth of population and vehicular traffic has necessitated effective urban planning strategies to mitigate traffic congestion and enhance roadway efficiency.This study focuses on a critical signalized intersection in Konya, Turkiye's largest metropolitan area, which is notable for its agricultural, industrial, and educational significance.Strategically positioned at the nexus of major transportation routes linking the Black Sea and Central Anatolia regions to the Mediterranean and Aegean areas, Konya exhibits considerable logistical potential.The Cos andere intersection, located in the Selc uklu district, was selected for analysis due to its four-legged configuration, featuring three lanes on both the south and north approaches and two lanes on the east and west approaches.Additionally, suitable turning islands and U-turn pockets are provided on the south and north approaches.Observational data indicate that the evening peak period poses significant operational challenges.A video surveillance system was employed to monitor vehicle movements, yielding a traffic volume of 1,874 vehicles per hour.The existing geometric design, traffic dynamics, and signalization were modelled using PTV Vissim software to assess the intersection's performance.The analysis revealed an average delay of 44.1 seconds per vehicle, an average of 0.9 stops per vehicle, and an average vehicle speed of 29.6 km/h, resulting in a Level of Service (LOS) classification of D. These findings indicate that the intersection currently accommodates traffic demand to a moderate degree.However, substantial improvements in operational efficiency could be achieved through enhancements to the signalization system, including the potential implementation of an adaptive traffic signal control system.This study provides valuable insights for traffic management authorities and urban planners aiming to optimise intersection performance in rapidly developing urban environments.