923 resultados para Distributed Traffic Control


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The aim of this paper is to describe an intelligent system for the problem of real time road traffic control. The purpose of the system is to help traffic engineers in the selection of the state of traffic control devices on real time, using data recorded by traffic detectors on motorways. The system follows an advanced knowledge-based approach that implements an abstract generic problem solving method, called propose-and-revise, which was proposed in Artificial Intelligence, within the knowledge engineering field, as a standard cognitive structure oriented to solve configuration design problems. The paper presents the knowledge model of such a system together with the strategy of inference and describes how it was applied for the case of the M-40 urban ring for the city of Madrid.

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This paper describes a general approach for real time traffic management support using knowledge based models. Recognizing that human intervention is usually required to apply the current automatic traffic control systems, it is argued that there is a need for an additional intelligent layer to help operators to understand traffic problems and to make the best choice of strategic control actions that modify the assumption framework of the existing systems.

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A study which examines the use of aircraft as wind sensors in a terminal area for real-time wind estimation in order to improve aircraft trajectory prediction is presented in this paper. We describe not only different sources in the aircraft systems that provide the variables needed to derivate the wind velocity but the capabilities which allow us to present this information for ATM Applications. Based on wind speed samples from aircraft landing at Madrid-Barajas airport, a real-time wind field will be estimated using a data processing approach through a minimum variance method. Finally the accuracy of this procedure will be evaluated for this information to be useful to Air Traffic Control.

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Federal Highway Administration, ITS Joint Program Office, Washington, D. C.

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Mode of access: Internet.

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Texas State Department of Highways and Public Transportation, Transportation Planning Division, Austin

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Federal Highway Administration, Office of Research, Washington, D.C.

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Federal Highway Administration, Washington, D.C.

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Federal Highway Administration, Office of Research and Development, Washington, D.C.

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Federal Highway Administration, Office of Research and Development, Washington, D.C.

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Federal Highway Administration, Office of Research and Development, Washington, D.C.

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New Mexico State Highway and Transportation Department, Santa Fe

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Federal Highway Administration, Washington, D.C.

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Federal Highway Administration, Office of Research, Washington, D.C.

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Turner-Fairbank Highway Research Center, McLean, Va.