Alfred Steven Z. Jordan | Jhorel Bryan M. Rivera | Bea Bianca T. Uy | Trisha Mae G. Villamin
Discipline: Civil Engineering
Efficient intersection management is essential in mitigating urban traffic congestion, particularly in rapidly developing cities. This study proposes and evaluates an alternative traffic control system for the Pan-Philippine Highway intersection in Barangay San Rafael, San Pablo City, Laguna, Philippines, through the design of roundabout configurations and microscopic traffic simulation. Field data were collected using CCTV-based manual vehicle counting across multiple peak-hour periods to determine traffic volume, flow characteristics, and Level of Service (LOS). Results revealed consistently high traffic demand, with LOS ranging from C to F under the existing intersection control system, indicating moderate to severe congestion. To address these issues, two roundabout designs (2-lane and 3-lane) were developed in accordance with the National Structural Code of the Philippines (NSCP) and Department of Public Works and Highways (DPWH) standards. The proposed designs were evaluated using PTV VISSIM microscopic simulation to replicate real-world traffic conditions and assess operational performance under identical demand scenarios. Simulation results demonstrated significant improvements in traffic efficiency, with the 3-lane roundabout achieving LOS A across all movements, indicating free-flow conditions, while the 2-lane roundabout yielded LOS ranging from A to D. The findings confirm that roundabout implementation substantially enhances intersection performance by reducing congestion and improving traffic distribution. Among the tested alternatives, the 3-lane roundabout emerged as the most effective configuration. This study contributes a simulation-based framework for intersection redesign and provides evidence supporting roundabout implementation as a viable solution for urban traffic management in developing cities.
ISSN 2467-5172 (Print)
Philippine E-Journals
