Analisis Kinerja Simpang Tak Bersinyal pada Pertigaan Kediri Lombok Barat

Abstract

Abstract: The Kediri Three-Way Intersection in West Lombok Regency is an unsignalized three-way intersection that plays a vital role as a regional transportation hub; however, its performance deteriorates during peak hours due to heavy traffic flow, geometric constraints, and roadside activities. This study aims to evaluate the intersection’s operational performance based on capacity, Degree of Saturation (DJ), delay, and Queuing Probability (PA), as well as to formulate appropriate solutions tailored to existing conditions. The study employs a deductive quantitative approach, referencing the 2023 Indonesian Road Capacity Guidelines (PKJI) for unsignalized intersections. Primary data including road geometry, traffic volume, and side obstacle conditions were obtained through a field survey conducted over three days of observation during the morning, afternoon, and evening, while secondary data were used to support the site characteristics. The day with the highest traffic volume was used as the basis for performance evaluation. The analysis results showed a total traffic flow of 3,513.4 vehicles per hour, an intersection capacity of 3,271.83 vehicles per hour, and a DJ of 1.074, which exceeds the planned performance threshold of 0.85. The average traffic delay was 19.12 seconds per vehicle, and the intersection delay was 23.01 seconds per vehicle, while the PA ranged from 46.50% to 92.70%. These conditions indicate that the intersection is already at capacity and has the potential to generate long queues. Recommended measures include installing traffic signals, removing lateral obstructions, optimizing road markings and signs, and channeling left-turn traffic to reduce conflicts and increase the intersection’s effective capacity.

Abstrak: Pertigaan Kediri di Kabupaten Lombok Barat merupakan simpang tiga tak bersinyal yang memiliki fungsi penting sebagai penghubung pergerakan regional, tetapi mengalami penurunan kinerja pada periode jam puncak akibat tingginya arus lalu lintas, keterbatasan geometrik, dan aktivitas samping jalan. Penelitian ini bertujuan mengevaluasi kinerja operasional simpang berdasarkan kapasitas, Derajat Kejenuhan (DJ), tundaan, dan Peluang Antrean (PA), serta merumuskan penanganan yang sesuai dengan kondisi eksisting. Penelitian menggunakan pendekatan kuantitatif deduktif dengan acuan Pedoman Kapasitas Jalan Indonesia (PKJI) 2023 untuk simpang tak bersinyal. Data primer berupa geometrik jalan, volume lalu lintas, dan kondisi hambatan samping diperoleh melalui survei lapangan selama tiga hari pengamatan pada periode pagi, siang, dan sore, sedangkan data sekunder digunakan untuk mendukung karakteristik lokasi. Hari dengan pembebanan tertinggi digunakan sebagai dasar evaluasi kinerja. Hasil analisis menunjukkan arus lalu lintas total sebesar 3.513,4 smp/jam, kapasitas simpang sebesar 3.271,83 smp/jam, dan DJ sebesar 1,074, sehingga nilai tersebut melampaui batas kinerja rencana 0,85. Tundaan lalu lintas rata-rata sebesar 19,12 detik/smp dan tundaan simpang sebesar 23,01 detik/smp, sedangkan PA berada pada rentang 46,50%–92,70%. Kondisi tersebut menunjukkan simpang telah berada pada keadaan jenuh dan berpotensi menghasilkan antrean panjang. Penanganan yang direkomendasikan meliputi pemasangan APILL, penertiban hambatan samping, optimalisasi marka dan rambu, serta kanalisasi gerakan belok kiri untuk mengurangi konflik dan meningkatkan kapasitas efektif simpang.