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    Reliability Analysis of Minimum Pedestrian Green Interval for Traffic Signals

    Source: Journal of Transportation Engineering, Part A: Systems:;2013:;Volume ( 139 ):;issue: 007
    Author:
    Said M. Easa
    ,
    Jianchuan Cheng
    DOI: 10.1061/(ASCE)TE.1943-5436.0000549
    Publisher: American Society of Civil Engineers
    Abstract: The current method of computing the minimum pedestrian green interval for intersection signal timing assumes that the component variables are deterministic. This paper presents a probabilistic method in which the pedestrian start-up time and walking speed are random variables. To establish pedestrian characteristics, data were collected at 14 intersections in downtown, suburban, and tourist areas. The method is based on a safety margin that is defined as the difference between the supplied and demanded green intervals, where the demanded green interval is a random variable. Relationships for the mean and standard deviation of the safety margin of the demanded green interval are developed on the basis of the first-order second-moment analysis. A closed-form solution for the minimum supplied green interval is then derived as a function of the relevant variables, including the vehicular intergreen interval and its component variables. A procedure for establishing the walk and the flashing “don’t walk” intervals is presented. Graphical aids for determining the minimum pedestrian green interval were developed, and application of the proposed method is illustrated using numerical examples. The sensitivity analysis shows that the minimum pedestrian green interval is much more sensitive to the walking speed than the start-up time or their correlation.
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      Reliability Analysis of Minimum Pedestrian Green Interval for Traffic Signals

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    http://yetl.yabesh.ir/yetl1/handle/yetl/69574
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    • Journal of Transportation Engineering, Part A: Systems

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    contributor authorSaid M. Easa
    contributor authorJianchuan Cheng
    date accessioned2017-05-08T22:02:27Z
    date available2017-05-08T22:02:27Z
    date copyrightJuly 2013
    date issued2013
    identifier other%28asce%29te%2E1943-5436%2E0000593.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/69574
    description abstractThe current method of computing the minimum pedestrian green interval for intersection signal timing assumes that the component variables are deterministic. This paper presents a probabilistic method in which the pedestrian start-up time and walking speed are random variables. To establish pedestrian characteristics, data were collected at 14 intersections in downtown, suburban, and tourist areas. The method is based on a safety margin that is defined as the difference between the supplied and demanded green intervals, where the demanded green interval is a random variable. Relationships for the mean and standard deviation of the safety margin of the demanded green interval are developed on the basis of the first-order second-moment analysis. A closed-form solution for the minimum supplied green interval is then derived as a function of the relevant variables, including the vehicular intergreen interval and its component variables. A procedure for establishing the walk and the flashing “don’t walk” intervals is presented. Graphical aids for determining the minimum pedestrian green interval were developed, and application of the proposed method is illustrated using numerical examples. The sensitivity analysis shows that the minimum pedestrian green interval is much more sensitive to the walking speed than the start-up time or their correlation.
    publisherAmerican Society of Civil Engineers
    titleReliability Analysis of Minimum Pedestrian Green Interval for Traffic Signals
    typeJournal Paper
    journal volume139
    journal issue7
    journal titleJournal of Transportation Engineering, Part A: Systems
    identifier doi10.1061/(ASCE)TE.1943-5436.0000549
    treeJournal of Transportation Engineering, Part A: Systems:;2013:;Volume ( 139 ):;issue: 007
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian