A continuous-flow-intersection-lite design and traffic control for oversaturated bottleneck intersections |
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| Institution: | 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. Department of Civil and Environmental Engineering and Engineering Mechanics, University of Dayton, 300 College Park Ave., Dayton, OH 45469, United States;2. Aylo Engineering S.A.R.L., Kornet Chehwen, Main Road, Metn, Lebanon;3. Geotest Engineering, Inc., 5600 Bintliff, Houston, TX 77036, United States;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;1. Department of Civil, Structural and Environmental Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, United States;2. Department of Industrial and Systems Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, United States;1. Department of Industrial Engineering, Tsinghua University, Beijing 100084, China;2. Department of Civil Engineering, Tsinghua University, Beijing 100084, China;1. Traffic Engineering Group, Institute for Transport Planning and Systems, ETH Zurich, Switzerland;2. Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, PA 16802, United States |
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| Abstract: | Oversaturation has become a severe problem for urban intersections, especially the bottleneck intersections that cause queue spillover and network gridlock. Further improvement of oversaturated arterial traffic using traditional mitigation strategies, which aim to improve intersection capacity by merely adjusting signal control parameters, becomes challenging since exiting strategies may (or already) have reached their “theoretical” limits of optimum. Under such circumstance, several novel unconventional intersection designs, including the well-recognized continuous flow intersection (CFI) design, are originated to improve the capacity at bottleneck intersections. However, the requirement of installing extra sub-intersections in a CFI design would increase vehicular stops and, more critically, is unacceptable in tight urban areas with closed spaced intersections. To address these issues, this research proposes a simplified continuous flow intersection (called CFI-Lite) design that is ideal for arterials with short links. It benefits from the CFI concept to enable simultaneous move of left-turn and through traffic at bottleneck intersections, but does not need installation of sub-intersections. Instead, the upstream intersection is utilized to allocate left-turn traffic to the displaced left-turn lane. It is found that the CFI-Lite design performs superiorly to the conventional design and regular CFI design in terms of bottleneck capacity. Pareto capacity improvement for every traffic stream in an arterial system can be achieved under effortless conditions. Case study using data collected at Foothill Blvd in Los Angeles, CA, shows that the new design is beneficial in more than 90% of the 408 studied cycles. The testing also shows that the average improvements of green bandwidths for the synchronized phases are significant. |
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| Keywords: | Oversaturation Unconventional intersection design Continuous flow intersection Capacity analysis Signal control Multi-objective mixed integer programming |
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