Study of Geometric Design Interaction, Speed Behavior, and Accident Potential on Urban Road Segments
DOI:
https://doi.org/10.52920/jttl.v7i1.540Keywords:
road geometry, road safety, traffic conflicts, urban curve, vehicle speedAbstract
Road safety on curved segments that directly interact with at-grade intersections in urban areas remains a serious challenge in Indonesia. This study aims to analyze the relationship between road geometric characteristics (curve radius, superelevation, lane width, and stopping sight distance) on vehicle speed and traffic conflict potential, while formulating mitigation strategies at three curve locations in Kediri City intersections. A quantitative descriptive-analytic approach was applied through geometric measurement according to PDGJ 2021, spot speed surveys on 2,455 vehicle samples, and conflict observation using the Swedish Traffic Conflict Technique on 522 conflict events during peak hours. Results show stopping sight distance as the most dominant geometric variable on speed (r = +0.590; R² = 0.997), followed by curve radius (r = -0.436) and superelevation (r = +0.404). Geometric correlation with serious conflict frequency is weak (r = -0.191 to +0.224), while 94.6% of 522 events are serious conflicts. Merging conflicts dominate on Ahmad Dahlan Road, whereas stopping conflicts occur exclusively on Imam Bonjol Road due to stopping sight distance deficiency. Mitigation strategies are formulated based on seven hierarchical risk factors encompassing infrastructure improvement, traffic management, and integrated road user behavior interventions.
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