夜間における自動運転権限委譲要求タイミングが運転行動に及ぼす影響

抄録

In this research, we investigated the effect of allowance time on driver behavior when the Request-To-Intervene (RTI) at nighttime driving. We also analyzed driver behavior at RTI using the concepts of Situation Awareness (SA) and the behavioral analysis description method. The experiment was performed using a driving simulator, and a RTI occurs when the subjects was driving using level 3 of automated driving at night. After that, the subjects operate the steering wheel to avoid obstacles. As a result of the experiment, the lighting area of the driving beam was limited at night, so the obstacles moved out of the lighting area when Time-To-Collision (TTC) exceeded 7 seconds. Therefore, the driver was unable to responds to RTI driving behavior because no obstacles were detected. On the other hand, it was found that if TTC is shorter than 5 seconds, there is a high possibility of inducing a sudden operation the driver, and there is not enough time to confirm driving safety, so we think this driving condition is not suitable for RTI timing. Therefore, we think 7 seconds is enough for RTI timing at night. If this timing is secured, safety operation to avoid the collision to the obstacle is possible.