Application of the Greenshield, Greenberg, Underwood, and Bell Models in Evaluating the Capacity of the Lembar Highway Segment (Rural Road) with Comparison to PKJI 2023
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Lembar Highway is the main corridor connecting Lembar Port with the areas in West Lombok Regency, West Nusa Tenggara. This road plays an important role as the primary vehicle access route to Lembar Port, which serves as the main ferry port connecting Lombok and Bali. The high level of activity along this road has led to an increase in traffic volume, affecting vehicle speed and traffic density levels. In addition, side friction is frequently observed along the Lembar Highway section, which may influence the relationship between speed, density, and traffic flow. This study aims to analyze the relationship between the three main traffic parameters, namely traffic volume, speed, and density on Lembar Main Road, using the Greenshield, Greenberg, Underwood, and Bell models, as well as comparing the maximum volume obtained from the selected model with the road capacity based on PKJI 2023. The analysis results indicate that the most suitable model for all three observed segments, which have different levels of side friction categorized as high, medium, and low, is the Greenshield model. The comparison between the capacity according to PKJI 2023 and the maximum volume from the selected model shows that the maximum volume value is still below the road capacity, indicating that the road section is still capable of accommodating the existing traffic flow.
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