Driver's Trust in Automted Driving when Passing Other Traffic Objects

The aim of this study was to investigate perspectives for securing driver's trust in automated driving. We considered driving scenes of passing other traffic objects (a bicycle or a scooter) and the relationship between the drivers' trust and the variety of speeding, taking lateral distance and steering timing by automated driving. A driving simulator study was implemented to investigate effects of applying characteristics of manual driving for each driver into design on drivers' trust when passing the objects. The results showed that driver's trust was affected by driver subjective speed, lateral distance and steering timing for automated driving. A longer lateral distance and an earlier steering timing for automated driving compared to manual driving contributed to subjectively appropriate speed and steering timing. Moreover the automated passing speed was regarded as an appropriate one if automated vehicles take the same or slightly slower speed compared to manual driving.