Analysis of the Application of Underpass at the Cibiru Roundabout Using PTV VISSIM

Traffic congestion is a persistent global issue, particularly in densely populated cities like Bandung, Indonesia. The construction of an underpass offers a potential solution to reduce congestion at high-density intersections, such as the Cibiru Roundabout, which connects JL. Soekarno-Hatta, JL. Cibiru, and JL. A.H Nasution. This research analyzes traffic performance and assesses the feasibility of implementing an underpass at this location. A quantitative descriptive research method was used, with data collected through field measurements of vehicle volume and speed. The analysis followed the Indonesian Road Capacity Guidelines (PKJI) 2023 to evaluate capacity, degree of saturation, and service level. Using PTV VISSIM software, simulations were conducted to project traffic conditions over the next ten years, considering a 5% annual growth rate. Results indicate significant congestion, with service levels reaching "F" across various segments. Simulation outcomes suggest that an underpass would improve traffic flow by increasing capacity, reducing delays, and shortening queues. This study provides a valuable reference for urban planners seeking effective interventions in other cities facing similar traffic challenges.