Optimal operation of displaced left-turn intersections: A lane-based approach |
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| Institution: | 1. University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai, PR China;2. Key Laboratory of Road and Traffic Engineering of the Ministry of Education, 4800 Cao’an Road, Shanghai, PR China;3. Department of Systems and Industrial Engineering, University of Arizona, Tucson, AZ, USA;1. University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai, PR China;2. Department of Civil and Environmental Engineering, University of Wisconsin at Milwaukee, P.O. Box 784, Milwaukee, WI, United States;3. Key Laboratory of Road and Traffic Engineering of the Ministry of Education, 4800 Cao’an Road, Shanghai, PR China;1. Department of Industrial Engineering, Tsinghua University, Beijing 100084, China;2. Department of Civil Engineering, Tsinghua University, Beijing 100084, China;1. School of Transportation Science and Engineering, Beihang University, Beijing, China;2. Beijing Key Laboratory for Cooperative Vehicle Infrastructure Systems and Safety Control, Beihang University, Beijing, China;1. University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai, PR China;2. Department of Civil and Environmental Engineering, University of Wisconsin at Milwaukee, P.O. Box 784, Milwaukee, WI, United States |
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| Abstract: | Displaced left-turn (DLT) intersections that resolve the conflict between left-turn and opposing-through movements at the pre-signal are probably the most extensively used innovative intersection designs. The DLT intersection concept can be extended to ten different types according to the location of the left-turn transition area, the number of DLT approaches, and the possible setting of the bypass right-turn lane. This paper presents a generalized lane-based optimization model for the integrated design of DLT intersection types, lane markings, the length of the displaced left-turn lane, and the signal timings. The optimization is formulated as a mixed-integer non-linear program. This program is further transformed to a series of mixed-integer linear programming problems that can be solved by the standard branch-and-bound technique. Results from extensive numerical analyses reveal the effectiveness of the proposed method, as well as the promising property of assisting transportation professionals in the proper selection of DLT intersection types, and the design of geometric layout and signal timings. |
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| Keywords: | Displaced left-turn intersections Integrated design Capacity Mixed-integer-non-linear-program |
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