The report discusses the scope, magnitude, and root causes of the congestion/saturation problem as determined by a questionnaire survey of traffic engineering professionals and by an extensive set of personal and telephone interviews. In general, the root causes of congestion--as perceived by these practitioners--are founded in lack of alternate routes, in land use policies that generate the traffic patterns, and in vehicle-pedestrian conflicts that aggravate the situation. The engineer is faced with too much traffic, in too little space, in too short a time. Therefore, it must be recognized that the problem should be first attacked at the root causes. Measures of saturation were identified from a complete review of the relevant literature, a thorough analysis of candidate measures, and a program of field work via time-lapse photography. The results of this work were then used to define a set of appropriate measures and to develop definitions of the various levels of saturation. A range of treatments was studied via simulation--the UTCS-1 model simulator was used extensively--analytical methods, and some supportive fieldwork. The various candidate treatments and remedies are discussed in terms of three major categories: minimal-response signal policies, highly responsive signal policies, and other treatments in a signalized environment. Two working papers were also developed as part of this effort. One presents a highly responsive queue-activated control policy. The other analyzes the regularity of the vehicular traffic patterns. This report also contains a set of guidelines developed for the treatment of traffic congestion on street networks. The guidelines provide both a tutorial and an illustrated reference in what techniques to consider and how to consider them systematically.


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    Title :

    Traffic Control in Oversaturated Street Networks


    Contributors:
    L. J. Pignataro (author) / W. R. McShane (author) / K. W. Crowley (author) / B. Lee (author) / T. W. Casey (author)

    Publication date :

    1978


    Size :

    166 pages



    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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