Modello di capacità e valutazione delle prestazioni per le rotatorie a turbina

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    Abstract

    [automatically translated] The latest evolution of roundabout intersections has been directed toward the so-called schemes turbine (turborotatorie) with the aim to ensure higher safety than traditional patterns. The few examples of implementation of roundabouts turbine does not, however, have so far enabled the development of methods of analysis of the operating conditions and capacity models that can boast a validation through field observations. Anyhow, the theoretical approach to the study of functional turborotatorie presents aspects decidedly more complex than those of conventional roundabouts both because of the trajectories of incoming flows (forced to merge into physically separate lanes) both for the turbine configuration of the annular track and of the system of precedence that is established in the entrance roundabout. They profoundly modified, compared to conventional roundabouts, the patterns of conflict between the incoming flow and the flow of contrast and, accordingly, the capacity of applicable models and criteria for the evaluation of the performance of the intersection. From these considerations, given the state of knowledge, in this memory it is proposed a criterion for assessment of the capacity of turborotatorie based on some existing formulations for the intersections regulated by the previously signal, for which it is possible to refer to the acceptance gap theory. Even with the limitations of an exclusively theoretical discussion, the main approach followed objectives are: i) determine the domain of convenience (in capacitive terms) of roundabouts with turbine configuration than conventional; ii) evaluate the performance indices (delays, queue lengths and levels of service) more closely to the actual operation of turborotatorie Even with the limitations of an exclusively theoretical discussion, the main approach followed objectives are: i) determine the domain of convenience (in capacitive terms) of roundabouts with turbine configuration than conventional; ii) evaluate the performance indices (delays, queue lengths and levels of service) more closely to the actual operation of turborotatorie Even with the limitations of an exclusively theoretical discussion, the main approach followed objectives are: i) determine the domain of convenience (in capacitive terms) of roundabouts with turbine configuration than conventional; ii) evaluate the performance indices (delays, queue lengths and levels of service) more closely to the actual operation of turborotatorie
    Original languageItalian
    Publication statusPublished - 2008

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