In the authors previous study, the authors proposed deceleration for collision avoidance (DCA) as an index to evaluate collision risks against forward obstacles and examined the effectiveness of their forward obstacles collision warning system (FOCWS) based on DCA. In the present manuscript, they improve the visual interface of the FOCWS, and conduct driving simulator experiments to quantitatively evaluate the effectiveness of the improved FOCWS in situations where a preceding vehicle decelerates abruptly. The experimental results revealed that the FOCWS based on DCA was effective in assisting drivers to shorten the reaction time and to avoid collisions. Moreover, in the subjective assessment questionnaire, a significant number of experimental participants reported that the FOCWS based on DCA could evaluate collision risks more properly compared with the FOCWS based on a time-to-collision.

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Effectiveness of forward obstacles collision warning system based on deceleration for collision avoidance

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