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    Delay Models for Mixed Platoon and Secondary Flows

    Source: Journal of Transportation Engineering, Part A: Systems:;1988:;Volume ( 114 ):;issue: 002
    Author:
    Nagui M. Rouphail
    DOI: 10.1061/(ASCE)0733-947X(1988)114:2(131)
    Publisher: American Society of Civil Engineers
    Abstract: A mathematical model is described for estimating approach delays at pretimed, signalized, coordinated intersections. The delay models incorporate the size of and flow rate within the progression bandwidth. Platoon dispersion and secondary flows are considered via a simplified platoon‐dispersion algorithm calibrated from the TRANSYT‐7F model. The basic premise in this study is that traffic is assumed to arrive at the progressed approach in two average flow rates, one within the progression bandwidth, and another outside of it. This modeling concept represents a middle ground between bandwidth models that assume a constant flow rate in the dispersed platoon and TRANSYT‐like techniques where arrival flow rates vary in each time slice of the cycle length. The delay models are evaluated with Webster's delay formula for random arrivals and with simulated data in NETSIM; in both cases the results compare very favorably. Pending field validation of the delay estimates, an immediate application of the models is the development of progression adjustment factors, which can be readily estimated from system signal‐timing parameters and flow rates derived herein.
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      Delay Models for Mixed Platoon and Secondary Flows

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    contributor authorNagui M. Rouphail
    date accessioned2017-05-08T21:02:23Z
    date available2017-05-08T21:02:23Z
    date copyrightMarch 1988
    date issued1988
    identifier other%28asce%290733-947x%281988%29114%3A2%28131%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/36366
    description abstractA mathematical model is described for estimating approach delays at pretimed, signalized, coordinated intersections. The delay models incorporate the size of and flow rate within the progression bandwidth. Platoon dispersion and secondary flows are considered via a simplified platoon‐dispersion algorithm calibrated from the TRANSYT‐7F model. The basic premise in this study is that traffic is assumed to arrive at the progressed approach in two average flow rates, one within the progression bandwidth, and another outside of it. This modeling concept represents a middle ground between bandwidth models that assume a constant flow rate in the dispersed platoon and TRANSYT‐like techniques where arrival flow rates vary in each time slice of the cycle length. The delay models are evaluated with Webster's delay formula for random arrivals and with simulated data in NETSIM; in both cases the results compare very favorably. Pending field validation of the delay estimates, an immediate application of the models is the development of progression adjustment factors, which can be readily estimated from system signal‐timing parameters and flow rates derived herein.
    publisherAmerican Society of Civil Engineers
    titleDelay Models for Mixed Platoon and Secondary Flows
    typeJournal Paper
    journal volume114
    journal issue2
    journal titleJournal of Transportation Engineering, Part A: Systems
    identifier doi10.1061/(ASCE)0733-947X(1988)114:2(131)
    treeJournal of Transportation Engineering, Part A: Systems:;1988:;Volume ( 114 ):;issue: 002
    contenttypeFulltext
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