Despite the wide application of floating car data (FCD) in urban link travel time estimation, limited efforts have been made to determine the minimum sample size of floating cars appropriate to the requirements for travel time distribution (TTD) estimation. This study develops a framework for seeking the required minimum number of travel time observations generated from FCD for urban link TTD estimation. The basic idea is to test how, with a decreasing the number of observations, the similarities between the distribution of estimated travel time from observations and those from the ground-truth vary. These are measured by employing the Hellinger Distance (HD) and Kolmogorov-Smirnov (KS) tests. Finally, the minimum sample size is determined by the HD value, ensuring that corresponding distribution passes the KS test. The proposed method is validated with the sources of FCD and Radio Frequency Identification Data (RFID) collected from an urban arterial in Nanjing, China. The results indicate that: (1) the average travel times derived from FCD give good estimation accuracy for real-time application; (2) the minimum required sample size range changes with the extent of time-varying fluctuations in traffic flows; (3) the minimum sample size determination is sensitive to whether observations are aggregated near each peak in the multistate distribution; (4) sparse and incomplete observations from FCD in most time periods cannot be used to achieve the minimum sample size. Moreover, this would produce a significant deviation from the ground-truth distributions. Finally, FCD is strongly recommended for better TTD estimation incorporating both historical trends and real-time observations.


    Zugriff

    Download

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Minimum Sampling Size of Floating Cars for Urban Link Travel Time Distribution Estimation


    Weitere Titelangaben:

    Transportation Research Record


    Beteiligte:
    Yun, Meiping (Autor:in) / Qin, Wenwen (Autor:in)


    Erscheinungsdatum :

    2019-03-03




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Minimum Sample Size Determination of Floating Cars in an Urban Hybrid Network

    Zhang, Zhaosheng / Xu, Xinyu / Gao, Li | ASCE | 2015


    Estimation of urban arterial travel time distribution considering link correlations

    Qin, Wenwen / Ji, Xiaofeng / Liang, Feiwen | Taylor & Francis Verlag | 2020


    On Estimation of Link Travel Time in Floating Car Systems

    Tsuge, Masakuni / Tokunaga, Masataka / Nakano, Keisuke et al. | Springer Verlag | 2010


    Urban Road Travel Speed Estimation Based on Low Sampling Floating Car Data

    Yue, Y. / Zou, H.X. / Li, Q.Q. | British Library Conference Proceedings | 2009