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<p>Advancing approaches to network design and addressing trade-offs between competing objective functions generate a spectrum of optimal solutions that, while complex, enable more comprehensive decision-making. To address these challenges, this study makes three key contributions: (1) Proposes a network-wide decision-making framework for intersection type conversion; (2) Shifts the focus from link-based to node-centric network design; and (3) Introduces the use of conflict indices as proactive surrogate safety measures, advancing safety-oriented urban transport planning. A bi-level, multi-objective optimization framework is implemented in this study, with the upper level guiding strategic decisions and the lower level executing traffic assignment. The framework is operationalized using empirical data from the urban road network of Dezful, Iran, providing a practical basis for model formulation and optimization. The primary objective is to determine the optimal configuration of node types—roundabouts versus unsignalized intersections—by evaluating the trade-offs between conflict indices and delay functions. Whereas classical studies such as LeBlanc produced a single solution for link-based configurations (e.g., 10110), this study offers a spectrum of solutions for six network nodes, ranging from all nodes configured as roundabouts to all nodes designed as unsignalized intersections. The findings reveal a diverse range of optimal solutions, offering practical insights to improve existing networks and inform the design of future urban transportation systems.</p>

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A Network-based Analysis of Congestion and Safety Performance for Converting Unsignalized Intersections to Roundabouts

  • 期刊论文

  • 发表日期：

    2026年4月29日

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  • Mehrdad Asgari,
  • Amin Mirza Boroujerdian

摘要

Advancing approaches to network design and addressing trade-offs between competing objective functions generate a spectrum of optimal solutions that, while complex, enable more comprehensive decision-making. To address these challenges, this study makes three key contributions: (1) Proposes a network-wide decision-making framework for intersection type conversion; (2) Shifts the focus from link-based to node-centric network design; and (3) Introduces the use of conflict indices as proactive surrogate safety measures, advancing safety-oriented urban transport planning. A bi-level, multi-objective optimization framework is implemented in this study, with the upper level guiding strategic decisions and the lower level executing traffic assignment. The framework is operationalized using empirical data from the urban road network of Dezful, Iran, providing a practical basis for model formulation and optimization. The primary objective is to determine the optimal configuration of node types—roundabouts versus unsignalized intersections—by evaluating the trade-offs between conflict indices and delay functions. Whereas classical studies such as LeBlanc produced a single solution for link-based configurations (e.g., 10110), this study offers a spectrum of solutions for six network nodes, ranging from all nodes configured as roundabouts to all nodes designed as unsignalized intersections. The findings reveal a diverse range of optimal solutions, offering practical insights to improve existing networks and inform the design of future urban transportation systems.