Volume 40 Issue 3
Jun.  2022
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NI Dingan, GUO Fengxiang, ZHOU Yanning. A Graph Study on Turning Behaviors of Older Drivers at Unsignalized Intersections[J]. Journal of Transport Information and Safety, 2022, 40(3): 108-117. doi: 10.3963/j.jssn.1674-4861.2022.03.011
Citation: NI Dingan, GUO Fengxiang, ZHOU Yanning. A Graph Study on Turning Behaviors of Older Drivers at Unsignalized Intersections[J]. Journal of Transport Information and Safety, 2022, 40(3): 108-117. doi: 10.3963/j.jssn.1674-4861.2022.03.011

A Graph Study on Turning Behaviors of Older Drivers at Unsignalized Intersections

doi: 10.3963/j.jssn.1674-4861.2022.03.011
  • Received Date: 2021-03-26
    Available Online: 2022-07-25
  • Considering the vision issues and slow response of older drivers, it is therefore important to study their turning behavior. Given this fact, the turning behavior of older drivers at unsignalized intersections are studied in this paper and a graph is developed to describe the changes of their driving behaviors over the time. A virtual simulation of driving scenes (including six unsignalized intersections) with different types of conflicts are developed based on a field survey. Next, older drivers and young/middle-aged drivers who meet requirements of simulation are recruited to conduct the experiment. Data regarding vehicle operation behaviors, eye movements, and physiological and psychological condition are collected to analyze the differences of behavioral characteristics between older and young/middle-aged groups of drivers under different turning scenarios. The Graph Theory is adopted to describe the features of behaviors for older and young/middle-aged drivers. Results show that for older drivers, the average of turning velocity is 20.4 km/h, fixation duration is 289.47 ms, and saccade amplitude is 3.51°. For young/middle-aged drivers, their average speed is 35.79 km/h, 247.94 ms and 4.56°, respectively. Older drivers are more nervous during the turning process since their time domain indicators (SDNN and RMSSD) and frequency domain indicators (LF/HF and TP) are lower. The graph indicates that the time of older drivers' nervousness lasts longer than young/middle-aged drivers do, and older drivers have a lower ability to collecting different information. Finally, the spatiotemporal differences from the graphs indicate that there are significant differences between the turning behavior of the two driver groups in left-turning scenarios, and the older drivers' turning behavior show a lower level of stability and safety.

     

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