Analisis dan Perbaikan Kinerja Simpang Tak Bersinyal Empat Lengan (Studi Kasus: Simpang Duta Berlian, Dramaga, Bogor)

Abstract

Simpang Duta Berlian di Kabupaten Bogor mengalami kemacetan akibat hambatan samping tinggi, tidak adanya sinyal lalu lintas (APILL), serta lebar pendekat yang sempit. Penelitian ini bertujuan menganalisis kinerja lalu lintas existing dan mengevaluasi skenario perbaikan dengan metode survei Classified Turning Movement Counting (CTMC) dan analisis berdasarkan PKJI 2023 dan Permenhub No. 96 Tahun 2015. Hasil survei menunjukkan volume puncak 3.949,6 SMP/jam melebihi kapasitas 3.668,5 SMP/jam dengan derajat kejenuhan (DJ) 1,08 dan tundaan 23,3 detik/SMP, tergolong LOS C. Empat skenario perbaikan diuji, termasuk pelebaran pendekat dan konversi menjadi simpang bersinyal. Skenario optimal berupa pelebaran minimal 2 meter serta penerapan APILL 4 fase dengan pemisahan belok kanan dan lajur belok kiri langsung (BKiJT). Skema ini menurunkan DJ menjadi 0,70 dan tundaan menjadi 12–15 detik/SMP (LOS B). Konversi menjadi simpang bersinyal dengan pengaturan arus dan pelebaran terbukti paling efektif, disarankan dilengkapi yellow box junction untuk meredam antrean antar fase, serta memiliki potensi menurunkan kecelakaan hingga 50%.

Duta Berlian Intersection in Bogor Regency faces severe congestion due to high side friction, absence of traffic signals (APILL), and insufficient approach widths. This study aims to analyze the current traffic performance and assess potential improvement scenarios using the Classified Turning Movement Counting (CTMC) method and guidelines from PKJI 2023 and Ministry Regulation No. 96 of 2015. Survey results indicate a peak traffic volume of 3,949.6 pcu/hour, exceeding the intersection’s capacity of 3,668.5 pcu/hour, with a degree of saturation (DS) of 1.08 and average delay of 23.3 seconds/pcu, categorized as LOS C. Four improvement scenarios were evaluated, including approach widening and conversion to a signalized intersection. The optimal scenario involves a minimum widening of 2 meters on each approach and implementation of a 4-phase APILL with separated right-turn lanes and direct left-turn lanes (BKiJT). This scenario reduces the DS to 0.70 and delay to 12–15 seconds/pcu (LOS B). Signalization with optimized geometry and movement separation is proven most effective, recommended to include a yellow box junction to prevent inter-phase blockage, and potentially reduce accident rates by up to 50%.