Traffic shockwaves demonstrate the formation and spreading of traffic fluctuation on roads. Existing methods mainly detect the shockwaves and their propagation by estimating traffic density and flow, which presents weaknesses in applications when traffic data is only partially or locally collected. This paper proposed a four-step data-driven approach that integrates machine learning with the traffic features to detect shockwaves and estimate their propagation speeds only using partial vehicle trajectory data. Specifically, we first denoise the speed data derived from trajectory data by the Fast Fourier Transform (FFT) to mitigate the effect of spontaneous random speed fluctuation. Next, we identify trajectory curves’ turning points where a vehicle runs into a shockwave and its speed presents a high standard deviation within a short interval. Furthermore, the Density-based Spatial Clustering of Applications with Noise algorithm (DBSCAN) combined with traffic flow features is adopted to split the turning points into different clusters, each corresponding to a shockwave with constant speed. Last, the one-norm distance regression method is used to estimate the propagation speed of detected shockwaves. The proposed framework was applied to the field data collected from the I-80 and US-101 freeway by the Next Generation Simulation (NGSIM) program. The results show that this four-step data-driven method could efficiently detect the shockwaves and their propagation speeds without estimating the traffic densities and flows nearby. It performs well for both homogenous and nonhomogeneous road segments with trajectory data collected from total or partial traffic flow.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    A data-driven traffic shockwave speed detection approach based on vehicle trajectories data


    Additional title:

    K. Yang et al.
    Journal of Intelligent Transportation Systems


    Contributors:
    Yang, Kaitai (author) / Yang, Hanyi (author) / Du, Lili (author)

    Published in:

    Publication date :

    2024-11-01


    Size :

    17 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Dynamic traffic shockwave speed estimation in connected vehicle environment

    Li, Jiangchen / Wang, Chenhao / He, Shuxian et al. | IEEE | 2017


    An Exploratory Shockwave Approach to Estimating Queue Length Using Probe Trajectories

    Cheng, Yang / Qin, Xiao / Jin, Jing et al. | Taylor & Francis Verlag | 2012



    Traffic Shockwave Detection in a Connected Environment using the Speed Distribution of Individual Vehicles

    Elfar, Amr / Xavier, Connie / Talebpour, Alireza et al. | Transportation Research Record | 2018


    Analysis of Shockwave Radiation Data in Nitrogen

    Cruden, Brett A. / Brandis, Aaron M. | AIAA | 2019