Analisis Perencanaan Penempatan Alat Pemberi Isyarat Lalu Lintas (Apill) Pada Simpang Tiga Tak Bersinyal Montong Di Kecamatan Batu Layar

Abstract

The unsignalized Montong three-way intersection in Batu Layar Subdistrict experiences fairly heavy traffic, especially during rush hour, which has the potential to cause conflicts, delays, and vehicle queues. This study aims to analyze the performance of the intersection’s current conditions based on capacity, degree of saturation, delay, and queue length; to plan the placement of traffic signal systems (APILL); and to determine changes in the intersection’s performance following APILL planning based on the 2023 Indonesian Road Capacity Guidelines (PKJI). The study employed a field observation method with video documentation to collect traffic volume data and conduct a geometric survey of the intersection. Traffic data collection was conducted for 16 hours on weekdays, from 6:00 AM to 10:00 PM WITA. Vehicle data were calculated based on vehicle type and direction of travel, then converted to passenger car units (SMP) and analyzed using the 2023 PKJI. The analysis included determining peak hours, capacity, degree of saturation, delay, queue length, base saturation flow, flow ratio, cycle time, and traffic signal phase allocation. The analysis results show that the existing conditions have a capacity of 2,756 SMP/hour, a degree of saturation of 0.603, a delay of 9.60 seconds/vehicle, and a queue probability of 15.25–32.17%. The traffic signal system design employs a three-phase configuration with a calculated cycle time of 40.753 seconds and green-light timing adjustments for each approach. After the traffic signal planning, the degree of saturation at each approach was 0.560, with an average delay of 12.20–22.19 seconds per vehicle and a queue length of 105.66–286.13 m. These results indicate that APILL can serve as an alternative for regulating vehicle traffic, but signal timing still requires further evaluation to minimize delay and queue length.