Connected and automated vehicles (CAVs) are expected to improve traffic safety effectively at signalized intersections. Considerable studies have been conducted to investigate the benefits of CAVs in improving traffic mobility and efficiency. However, in most previous research, vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) communication have been considered separately rather than concurrently, to study the characteristics of CAVs, resulting in the potential of CAVs not being fully exploited and inconsistency with reality. In this paper, an integrated communication system of CAVs (ICSC), which incorporates V2V and V2I communication, is proposed, to assess traffic safety at signalized intersections. In this study, the intelligent driver model (IDM) is used to approximate V2V communication between a subject CAV and preceding CAVs. A reinforcement learning algorithm is adopted to model V2I communication between a CAV and a traffic light. The traffic safety effect of ICSC, V2V-only, and V2I-only scenarios is evaluated for different market penetration rates (MPRs). The results show that the ICSC scenario significantly reduces traffic conflicts and outperforms V2V-only, V2I-only, and benchmark scenarios when the MPR is equal to or higher than 50% with different surrogate safety measures (SSMs), such as time-exposed deceleration (TED) to avoid crashing, time exposed time-to-collision (TET), and use of a spacing gap (SGAP). Moreover, the mobility effect of the ICSC scenario is studied, and appears to increase average speed and reduce delay time. Finally, the results suggest that the ICSC can improve traffic safety and mobility concurrently and exploit the potentials of CAVs at signalized intersections.


    Access

    Download

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Traffic Safety Assessment with Integrated Communication System of Connected and Automated Vehicles at Signalized Intersections


    Additional title:

    Transportation Research Record: Journal of the Transportation Research Board


    Contributors:
    Wang, Xu (author) / Jiang, Xinguo (author) / Li, Haibo (author) / Zhao, Xinyu (author) / Hu, Zuoan (author) / Xu, Chuan (author)


    Publication date :

    2023-09-09




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Optimizing Signalized Intersections Performance under Conventional and Automated Vehicles Traffic

    Pourmehrab, Mahmoud / Elefteriadou, Lily / Ranka, Sanjay et al. | ArXiv | 2017

    Free access

    Optimizing Signalized Intersections Performance Under Conventional and Automated Vehicles Traffic

    Pourmehrab, Mahmoud / Elefteriadou, Lily / Ranka, Sanjay et al. | IEEE | 2020


    Coupled Control of Traffic Signal and Connected Autonomous Vehicles at Signalized Intersections

    Dan Wang / Zhizhou Wu / Guosheng Ma et al. | DOAJ | 2023

    Free access