The symmetric intersection design and traffic control optimization |
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Institution: | School of Transportation and Logistics, Southwest Jiaotong University, No. 111, North 1st Section of Second Ring Road, Chengdu City, China;Civil and Environmental Eng., University of Nevada, Reno, 1664 N. Virginia Street, NV 89557, USA;Civil and Environmental Eng., Nagoya University, C1-2(651) Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan;Technical University Darmstadt, Otto-Berndt-Str. 2, 64287 Darmstadt, Germany;Queensland University of Technology, 2 George Street, GPO Box 2434, Brisbane, QLD 4001, Australia;School of Automation, Northwestern Polytechnical University, Xi''an 710072, Shaanxi, China;Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, PA 16802, United States |
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Abstract: | It is well recognized that the left-turning movement reduces the intersection capacity significantly, because exclusive left turn phases are needed to discharge left turn vehicles only. This paper proposes the concept of Left-Hand Traffic (LHT) arterial, on where vehicles follow left-hand traffic rules as in England and India. The unconventional intersection where a LHT arterial intersects with a Right-Hand Traffic (RHT) arterial is named as symmetric intersection. It is only need three basic signal phases to separate all conflicts at symmetric intersection, while it at least need four signal phases at a conventional intersection. So, compared with the conventional intersection, the symmetric intersection can provide longer green time for the left-turning and the through movement, which can increase the capacity significantly. Through-movement waiting areas (TWAs) can be set at the symmetric intersection effectively, which can increase the capacity and short the cycle length furthermore. And the symmetric intersection is Channelized to improve the safety of TWAs. The Binary-Mixed-Integer-Linear-Programming (BMILP) model is employed to formulate the capacity maximization problem and signal cycle length minimization problem of the symmetric intersection. The BMILP model can be solved by standard branch-and-bound algorithms efficiently and outputs the lane allocation, signal timing decisions, and other decisions. Experiments analysis shows that the symmetric intersection with TWAs can increase the capacity and short the signal cycle length. |
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Keywords: | Left-Hand Traffic arterial Unconventional intersection designs Symmetric intersection Capacity optimization Cycle length optimization |
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