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All Journal Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics Jurnal Ilmiah Universitas Batanghari Jambi Jurnal Ilmu dan Riset Akuntansi Sosiolium: Jurnal Pembelajaran IPS Bioeduca : Journal of Biology Education Jurnal Teknik Sipil Institut Teknologi Padang Jurnal Ilmiah Ilmu Terapan Universitas Jambi Jurnal Pendidikan Olahraga Journal of Modern Social and Humanities
Tri Wulan Sari, Tri Wulan
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IMPROVING U-TURN TRAFFIC PERFORMANCE THROUGH GEOMETRIC DESIGN OPTIMIZATION: EFFECTS ON VEHICLE SPEED AND QUEUE RATIO Latifa, Eva Azhra; Madani, Krismayang; Sari, Tri Wulan
Jurnal Ilmiah Ilmu Terapan Universitas Jambi Vol. 10 No. 4 (2026): Volume 10, Nomor 4, August 2026
Publisher : LPPM Universitas Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jiituj.v10i4.57222

Abstract

This study aims to evaluate the performance of existing and alternative U-turn geometric configurations in terms of vehicle speed and queue ratio under varying U-turn demand and traffic directions. Field survey data were analyzed using the Indonesian Highway Capacity Guidelines (PKJI 2023) to determine traffic volume, roadway capacity, degree of saturation, and vehicle speed. A microscopic traffic simulation was subsequently conducted using PTV Vissim to compare the existing U-turn configuration with two alternative geometric designs. The simulation considered U-turn proportions of 5%, 10%, 15%, 20%, and 25% in two traffic directions. Vehicle speed and queue ratio were used as the primary performance indicators. Under the existing configuration, peak-hour vehicle speed decreased to 21.5 km/h in the Margonda Raya direction, while the queue ratio reached approximately 2.8 when 25% of vehicles performed U-turns. Alternative geometric configurations improved traffic performance by increasing vehicle speed and reducing queue formation. Under the same peak-hour condition and 25% U-turn proportion, Alternative 2, a roundabout-type U-turn configuration, increased vehicle speed from 21.5 km/h to 33.19 km/h and reduced the queue ratio from 2.8 to 0.66 in the Margonda Raya direction. However, the effectiveness of the alternatives varied by traffic direction, with Alternative 1 delivering better queue performance in the Bogor Raya direction. The findings indicate that U-turn geometric performance is dependent on both U-turn demand and directional traffic characteristics. Therefore, U-turn design selection should not rely on a single geometric configuration but should consider traffic demand, directional flow characteristics, available road space, and operational performance.
Co-Authors Agung Budi Broto Awaliyah, Novia Aliestiani DYAH NURWIDYANINGRUM Eva Azhra Latifa Fredy Hermanto, Fredy Guntar Marolop Saragih, Guntar Marolop Hidayat, Ridwan Kemal, Muhammad Haikal Madani, Krismayang Mahmud Mahmud Marshanti, Lina MUHAMMAD FAHMI Muhammad Iqbal Filayani Muhammad Nafian Pujasmara, Destiana Eka Siti Umi Kalsum Sugeng Santoso Sujito Sujito Syamputra, Dhani Nur Indra Wahidahwati Wahidahwati Wiji Raharjo Zahra, Novridha Zainnuris