A continuous-flow-intersection-lite design and traffic control for oversaturated bottleneck intersections

•A simplified continuous flow intersection called CFI-Lite is proposed.•CFI-Lite does not need sub-intersections, thus is ideal for arterials with short links.•CFI-Lite performs superiorly to the conventional and CFI designs.•Pareto capacity improvement can be achieved in CFI-Lite under effortless c...

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Vydáno v:	Transportation research. Part C, Emerging technologies Ročník 56; s. 18 - 33
Hlavní autoři:	Sun, Weili, Wu, Xinkai, Wang, Yunpeng, Yu, Guizhen
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Elsevier India Pvt Ltd 01.07.2015
Témata:	Capacity analysis Continuous flow Continuous flow intersection Design engineering Foothills Intersections Multi-objective mixed integer programming Oversaturation Signal control Strategy Traffic engineering Traffic flow Unconventional intersection design Urban areas Oversaturation Signal control Continuous flow intersection Multi-objective mixed integer programming Capacity analysis Unconventional intersection design
ISSN:	0968-090X, 1879-2359
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Abstract	•A simplified continuous flow intersection called CFI-Lite is proposed.•CFI-Lite does not need sub-intersections, thus is ideal for arterials with short links.•CFI-Lite performs superiorly to the conventional and CFI designs.•Pareto capacity improvement can be achieved in CFI-Lite under effortless conditions. 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.
AbstractList	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. •A simplified continuous flow intersection called CFI-Lite is proposed.•CFI-Lite does not need sub-intersections, thus is ideal for arterials with short links.•CFI-Lite performs superiorly to the conventional and CFI designs.•Pareto capacity improvement can be achieved in CFI-Lite under effortless conditions. 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.
Author	Wang, Yunpeng Wu, Xinkai Sun, Weili Yu, Guizhen
Author_xml	– sequence: 1 givenname: Weili surname: Sun fullname: Sun, Weili organization: School of Transportation Science and Engineering, Beihang University, Beijing, China – sequence: 2 givenname: Xinkai surname: Wu fullname: Wu, Xinkai organization: School of Transportation Science and Engineering, Beihang University, Beijing, China – sequence: 3 givenname: Yunpeng surname: Wang fullname: Wang, Yunpeng organization: School of Transportation Science and Engineering, Beihang University, Beijing, China – sequence: 4 givenname: Guizhen surname: Yu fullname: Yu, Guizhen email: yugz@buaa.edu.cn organization: School of Transportation Science and Engineering, Beihang University, Beijing, China
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Snippet	•A simplified continuous flow intersection called CFI-Lite is proposed.•CFI-Lite does not need sub-intersections, thus is ideal for arterials with short... Oversaturation has become a severe problem for urban intersections, especially the bottleneck intersections that cause queue spillover and network gridlock....
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SubjectTerms	Capacity analysis Continuous flow Continuous flow intersection Design engineering Foothills Intersections Multi-objective mixed integer programming Oversaturation Signal control Strategy Traffic engineering Traffic flow Unconventional intersection design Urban areas
Title	A continuous-flow-intersection-lite design and traffic control for oversaturated bottleneck intersections
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