ANALISIS KELAYAKAN PEMBANGUNAN FLYOVER BERDASARKAN KINERJA LALU LINTAS PADA SIMPANG BERSINYAL KEBON ROEK, KOTA MATARAM

Abstract

The rapid growth of motorized vehicles in Mataram City, which is projected to exceed 560 thousand units by 2025, has led to increasing traffic congestion, particularly at Kebon Roek signalized intersection, located at junction Saleh Sungkar and Adi Sucipto Road. The existing traffic condition at this intersection indicates a relatively high level of saturation, with the degree of saturation during certain periods approaching or exceeding the critical threshold (DS ? 0.85). Furthermore, based on data from the Regional Infrastructure Development Plan (RPIW) 2022, the traffic performance of each intersection approach remains suboptimal, characterized by Level of Service (LOS) category D on the Adi Sucipto approach, LOS D on the Saleh Sungkar I approach, and LOS E on the Saleh Sungkar II approach. These conditions do not meet the minimum service standards required for primary arterial roads. This study aims to evaluate the feasibility of constructing a flyover as a long-term solution to vertically separate traffic flows and improve intersection capacity. Traffic performance analysis was conducted using the Indonesian Highway Capacity Manual (PKJI) 2023. The results show that under existing conditions, the intersection experiences a maximum delay of 157.9 s/pcu, resulting in an overall Level of Service of F, which reflects very poor traffic conditions. Following the implementation of the flyover, the intersection performance improves significantly, with the Level of Service increasing from LOS F to LOS B. This improvement is consistent with the minimum service standards for primary arterial roads, which require stable traffic flow and relatively smooth vehicle movement.