This paper aims to propose a method for assigning lane functions at entry approaches to achieve balanced saturation across lanes. With this design method, the traffic efficiency of n \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$n$$\end{document}-leg, N \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$N$$\end{document}-lane unsignalized roundabouts can be improved without the need for traffic signals. Firstly, the root arrays and degree arrays are defined to describe the results of entrance lane-use assignment, and the problem of lane-use assignment is transformed into the problem of solving the optimal values of integer variables. Then, the integer planning model is constructed with the objective function of minimizing the equilibrium saturation of each lane, and the solution method is given. Finally, the proposed method is applied to a given four-leg, three-lane unsignalized roundabout under 111 different directional volume ratios and the VISSIM software is used to simulate the roundabout's performance under high and low load situations before and after applying the lane-use assignment method. The simulation results show that under high load situation, after implementing the lane-use assignment at entry approaches, the average vehicle delay decreased for 109 volume ratios, and the level of service improved for 34 volume ratios. Under low load situation, the average vehicle delay decreased for 95 volume ratios, and the level of service improved for 27 volume ratios. The analysis results indicate that the method of lane-use assignment at entry approaches based on saturation equalization is an effective design approach for improving the operational efficiency of unsignalized roundabouts.


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    Title :

    Study on Optimal Design Method of Unsignalized Roundabout Considering Entrance Lane-Use Assignment


    Additional title:

    Lecture Notes in Civil Engineering


    Contributors:
    Meng, Lingyun (editor) / Qian, Yongsheng (editor) / Bai, Yun (editor) / Lv, Bin (editor) / Tang, Yuanjie (editor) / Wu, Hao (author) / Wu, Xianyu (author)

    Conference:

    International Conference on Traffic and Transportation Studies ; 2024 ; Lanzhou, China August 23, 2024 - August 25, 2024



    Publication date :

    2024-11-14


    Size :

    9 pages





    Type of media :

    Article/Chapter (Book)


    Type of material :

    Electronic Resource


    Language :

    English




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