The traffic flow on freeways is described traditionally with help of three parameters: space-mean speed v, time-mean traffic flow rate q, and space-mean traffic density k. The functional relationship between these three parameters is called Fundamental Diagram. The three parameters can in general be determined by measurements. These three parameters are associated by the fundamental relationship q = v · k with each other. Accordingly, the Fundamental Diagram is then defined clearly, if a function is defined between two of the three parameters. The Fundamental Diagram is featured by the following parameters: desire speed V0, maximum jam density kmax, maximum traffic flow rate qmax (=capacity C), and optimal density kopt that is corresponding to qmax. The relationship between traffic density k, traffic flow rate q, and speed v — represented in the q-v Diagram — forms the elementary Knowledge for dimensioning of freeways and rural highways. The traffic flow rate q(k) attainable at a given traffic density k serves as a measure of quality of the traffic. However, one in general employs during the analysis of the traffic quality the k-v relationship since this functional relationship is monotonously falling here. The speed v decreases continuously with the increase in traffic density k. As an example, a measured k-v relationship (on German freeway A43) is represented at the left side in Figure 1.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Modeling of Traffic Flow on Freeways in Fundamental Diagrams


    Beteiligte:
    Wu, Ning (Autor:in)

    Kongress:

    Second International Conference on Transportation and Traffic Studies (ICTTS ) ; 2000 ; Beijing, China



    Erscheinungsdatum :

    12.07.2000




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    Modeling of Traffic Flow on Freeways in Fundamental Diagrams

    Wu, N. / American Society of Civil Engineers / Chung-kuo kIo hsueh chi shu hsieh hui | British Library Conference Proceedings | 2000


    Traffic Flow Optimization on Freeways

    Rota, Bruno Carlo Rampinelli / Simic, Milan | Elsevier | 2016

    Freier Zugriff

    Characteristics of traffic flow on freeways

    May, Jr., A.D. | Engineering Index Backfile | 1959


    Safety Fundamental Diagram on Freeways

    Kuang, Yan / Qu, Xiaobo | ASCE | 2015


    Estimating Traffic Flow Rate on Freeways from Probe Vehicle Data and Fundamental Diagram

    Anuar, Khairul / Habtemichael, Filmon / Cetin, Mecit | IEEE | 2015