Volume 42 Issue 1
Feb.  2024
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Article Navigation >  Journal of Transport Information and Safety  > 2024  >  42(1): 28-40
MU Junlong, YANG Di, JIAO Chengwu, KONG Fanxing, CHEN Zhenghuan, XU Jin. Drivers' Mental Load Characteristics at the Entrance and Exit of High-density Interchanges Based on Heart Rate Variability[J]. Journal of Transport Information and Safety, 2024, 42(1): 28-40. doi: 10.3963/j.jssn.1674-4861.2024.01.004
Citation: MU Junlong, YANG Di, JIAO Chengwu, KONG Fanxing, CHEN Zhenghuan, XU Jin. Drivers' Mental Load Characteristics at the Entrance and Exit of High-density Interchanges Based on Heart Rate Variability[J]. Journal of Transport Information and Safety, 2024, 42(1): 28-40. doi: 10.3963/j.jssn.1674-4861.2024.01.004
shu

Drivers' Mental Load Characteristics at the Entrance and Exit of High-density Interchanges Based on Heart Rate Variability

doi: 10.3963/j.jssn.1674-4861.2024.01.004
  • 1.

    School of Traffic & Transportation, Chongqing Jiaotong University, Chongqing, 40074, China

  • 2.

    Yu Yao Plan Design & Research Institute of Communications, Yuyao 354001, Zhejiang, China

  • 3.

    Research Institute of Highway Ministry of Transport, Beijing 100088, China

  • 4.

    China Railway Eryuan Engineering Group Co Ltd, Chengdu 610031, China

  • Received Date: 2023-07-25
    Available Online: 2024-05-31
    Abstract
  • Interchange bridges serve as important nodes in road traffic networks, facilitating the redirection of traffic flows in different directions. Currently, high-density interchanges are increasingly common in urban road networks. With closer spacing of high-density interchanges compared to regular ones, denser vehicle weaving occurs and drivers are required to perform merging and diverging maneuvers in a shorter time. To investigate the impact of interchange spacing on drivers' mental load and the corresponding statistical characteristics in the entrances and exits of high-density interchanges, a segment of the Inner Ring Expressway in Chongqing with four consecutive interchanges, three of which are high-density interchanges, was selected as the research site. Electrocardiogram data from 47 drivers during on-road experiments were collected using in-vehicle instruments. Differential analysis was conducted on the temporal and spectral indices of driver heart rate variability between the entrances and exits of high-density and regular-spacing interchanges, revealing the distributions of drivers' mental load in these sections. The results indicate that: There is no significant difference in the temporal index of heart rate variability between drivers passing through the entrances and exits of regular-spacing and high-density interchanges. However, there is a significant difference in the spectral index, i.e., the ratio of low-frequency to high-frequency power of heart rate variability (LF/HF), which is believed can serve as the main indicator for evaluating drivers' mental load in interchange entrances and exits. When passing through the entrances of high-density interchanges, the LF/HF significantly increased compared to the one when passing through the entrances of regular-spacing interchanges, indicating that insufficient interchange spacing would increase mental load in the entrances of interchanges. Conversely, the LF/HF is significantly higher when passing through the exits of regular-spacing interchanges than the one when passing through the exits of high-density interchanges, indicating greater mental load when passing through exits of regular-spacing interchanges. For high-density interchanges, drivers' mental load in entrances are slightly higher than that in exits.

     

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