Potential Risk Assessment Algorithm in Car Following 2019-01-1024
In this paper, a potential risk assessment algorithm is proposed. Time to collision (TTC) is defined as an obvious risk assessment measure, whereas the time before the host vehicle has to decelerate in order to avoid a rear-end collision assuming that the target vehicle is braking is defined as the potential risk measure, i.e. time margin. The driving behavior of the human driver in the dangerous car following scenario is studied by using the naturalistic driving data, which includes 78 real dangerous car following dangerous scenarios collected by video drive record (VDR). TM and the dangerous car following scenarios are utilized to construct a potential risk assessment algorithm. The braking starting time during dangerous car following is identified. The TM at brake starting time of the 78 dangerous car following scenarios are applied to achieve the thresholds of the potential risk levels. It is found that the potential risk assessment algorithm can detect the possibility of dangers earlier than using TTC. And the potential risk assessment algorithm can describe the dangers when the relative speed of the host vehicle and the target vehicle is small.