A fundamental concept of system engineering is defining operating objectives. Then the appropriate strategy and the performance measure for assessing how well the system is working are selected. Two operating objectives are broadly shared by many agencies: reliable communication with the traffic signal infrastructure and good allocation of green times. The first objective is oriented toward asset management and the second toward operational efficiency. However, substantial synergies exist between the objectives. The proposed performance measures can be used for evaluating whether these objectives are being met. The quality of communication is evaluated by an examination of connectivity and data completeness and is based on an open standard telecommunications model. Opportunities to improve green time allocation are detected through an identification of operating patterns in which some phases routinely force off and other phases gap out in the same cycle. The performance measures are presented in an easy-to-understand visual format that practitioners can use. One outcome of this system engineering approach is the realization that many objectives can be achieved with a high-latency, low-bandwidth communication infrastructure if the appropriate processing techniques and performance measures are clearly articulated. The architecture and performance measures are explained in the context of a deployment of 122 intersections geographically distributed throughout the state of Indiana; data were collected during a 2.5-month period with a communication infrastructure that included commercial cellular data and agency-owned fiber.


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    Titel :

    Longitudinal Performance Measures for Assessing Agencywide Signal Management Objectives


    Weitere Titelangaben:

    Transportation Research Record


    Beteiligte:


    Erscheinungsdatum :

    2013-01-01




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch