Discerning free driving from car-following state is an important issue in modeling driver's longitudinal behavior. Existing studies suggested that there is a turning point for correlation coefficient of leading and following vehicles' speed between free driving and car-following states. In this paper, by applying the adopted method to trajectory data, a longer 12 s time gap threshold between free driving and car-following is reported. Also a notable difference across experienced and beginner driver groups is found. This study could provide some evidence on driver behavior heterogeneity, and also raise the doubt for a universal "free" vehicle standard.
Discerning Free Driving from Car-Following State Based on Trajectory Data from Active Mode Car-Following Experiment
11th International Conference of Chinese Transportation Professionals (ICCTP) ; 2011 ; Nanjing, China
ICCTP 2011 ; 776-787
2011-07-26
Conference paper
Electronic Resource
English
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