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    Introducing Two New Versions of Continuous Flow and Median U-Turn Combination Intersection Designs

    Source: Journal of Transportation Engineering, Part A: Systems:;2025:;Volume ( 151 ):;issue: 008::page 04025053-1
    Author:
    Amirarsalan Mehrara Molan
    ,
    William Rasdorf
    ,
    Ali Hajbabaie
    ,
    Gaurav Aryal
    ,
    Stephen Osafo-Gyamfi
    ,
    Hayden Edwards
    DOI: 10.1061/JTEPBS.TEENG-8837
    Publisher: American Society of Civil Engineers
    Abstract: In recent years, departments of transportation (DOTs) have shown an interest in implementing alternative intersections that combine features of two (or more) different designs. However, the current literature on the performance of these combination designs is limited. This paper reports on an assessment of the traffic operations and safety of two new combination intersection designs—continuous flow and median U-turn combination (CFI/MUT combo) and redirect two left-turn and one through (redirect 2L&T)—in comparison to four existing intersection designs: conventional, partial MUT, partial CFI, and reduced conflict intersection (RCI). Over 1,000 microsimulation runs were conducted in this study, considering different traffic demands, turning traffic ratios, and traffic demand distributions. For all simulation scenarios, traffic signals were optimized using Synchro, and the optimized signal data were imported into PTV VISSIM to obtain several performance measures such as vehicle travel time, queue length, and the number of stops for all designs considered. Safety analysis was also conducted using surrogate safety measures, including the US Federal Highway Administration’s Surrogate Safety Assessment Model (SSAM). Based on the results, both the CFI/MUT combo and redirect 2L&T showed potential in improving safety and operations at conventional intersections. The CFI/MUT combo exhibited statistically similar vehicle travel times to a partial CFI and outperformed all other designs. The redirect 2L&T demonstrated statistically similar travel times to the partial MUT but resulted in longer queue lengths. From a safety standpoint, the RCI is the safest intersection design among those considered.
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      Introducing Two New Versions of Continuous Flow and Median U-Turn Combination Intersection Designs

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    • Journal of Transportation Engineering, Part A: Systems

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    contributor authorAmirarsalan Mehrara Molan
    contributor authorWilliam Rasdorf
    contributor authorAli Hajbabaie
    contributor authorGaurav Aryal
    contributor authorStephen Osafo-Gyamfi
    contributor authorHayden Edwards
    date accessioned2025-08-17T22:23:02Z
    date available2025-08-17T22:23:02Z
    date copyright8/1/2025 12:00:00 AM
    date issued2025
    identifier otherJTEPBS.TEENG-8837.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4306860
    description abstractIn recent years, departments of transportation (DOTs) have shown an interest in implementing alternative intersections that combine features of two (or more) different designs. However, the current literature on the performance of these combination designs is limited. This paper reports on an assessment of the traffic operations and safety of two new combination intersection designs—continuous flow and median U-turn combination (CFI/MUT combo) and redirect two left-turn and one through (redirect 2L&T)—in comparison to four existing intersection designs: conventional, partial MUT, partial CFI, and reduced conflict intersection (RCI). Over 1,000 microsimulation runs were conducted in this study, considering different traffic demands, turning traffic ratios, and traffic demand distributions. For all simulation scenarios, traffic signals were optimized using Synchro, and the optimized signal data were imported into PTV VISSIM to obtain several performance measures such as vehicle travel time, queue length, and the number of stops for all designs considered. Safety analysis was also conducted using surrogate safety measures, including the US Federal Highway Administration’s Surrogate Safety Assessment Model (SSAM). Based on the results, both the CFI/MUT combo and redirect 2L&T showed potential in improving safety and operations at conventional intersections. The CFI/MUT combo exhibited statistically similar vehicle travel times to a partial CFI and outperformed all other designs. The redirect 2L&T demonstrated statistically similar travel times to the partial MUT but resulted in longer queue lengths. From a safety standpoint, the RCI is the safest intersection design among those considered.
    publisherAmerican Society of Civil Engineers
    titleIntroducing Two New Versions of Continuous Flow and Median U-Turn Combination Intersection Designs
    typeJournal Article
    journal volume151
    journal issue8
    journal titleJournal of Transportation Engineering, Part A: Systems
    identifier doi10.1061/JTEPBS.TEENG-8837
    journal fristpage04025053-1
    journal lastpage04025053-13
    page13
    treeJournal of Transportation Engineering, Part A: Systems:;2025:;Volume ( 151 ):;issue: 008
    contenttypeFulltext
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