Evaluating Functional Hierarchy of the Road Network Based on Trip Performance
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Date
2024-05
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Addis Ababa University
Abstract
The quality and performance of road networks are significantly influenced by the functional hierarchy of roadways in metropolitan area. The functional hierarchy of roads affects the design and operation of road networks, as well as the trip performance. The primary objective of this study was to assess the functional hierarchy of various road network patterns to understand their influence on trip performance. The scope of study includes evaluating the functional hierarchy of road networks and their impact on trip performance within a urban area of a chosen cites on up to 6 kilometers within a four-square-kilometer section of the city. It has a significant contribution to forecast future trip performance and support proactive planning. Additionally, it provides practical recommendations to guide urban planning agencies in optimizing road network hierarchy, ultimately benefiting urban residents and commuters globally.
Cities with higher junction densities, longer trip lengths, and a higher proportion of residential roads tend to experience longer travel durations within the network. This relationship modeled using a power function with logarism transformation which effectively captures the hierarchical structure of urban road networks. Interestingly, travel duration is significantly negatively affected by the presence of primary and secondary roads. Primary and secondary roads both show negative coefficients, indicating that higher proportions of these roads correlate with slightly reduced travel durations, likely due to their design for efficient travel. While the effect of primary roads is small but significant at p value of 0.00, secondary roads have a more substantial impact, emphasizing their importance in reducing travel time within the network. On the other hand, tertiary roads have a negligible and statistically insignificant effect on travel duration, suggesting that changes in their proportion do not distinctly influence travel time. However, residential roads demonstrate a significant positive relationship with travel duration with p value of 0.00, reflecting the duration of the trip has to be increased due to lower speed limit and existence of frequent stops typical in residential areas. Additionally, junction density showed a significant positive relationship with trip duration, with a p-value of 0.00. This indicates that as junction densities increase within the network, the trip duration also increases. The likely reason for this is that higher junction density implies more road connections from different directions.
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Keywords
Accessibility, Functional classification, Road hierarchy, Road network, OD Matrix, Mobility. SUMO.