Effects on Trust in Automated Driving Depending on System Behaviour towards another Vehicle

It is important to learn about the factors that affect driver’s trust in an automated driving system to maintain driver’s willingness to rely on the system. The purpose of this study was to investigate effects of differences in system response to another vehicle of automated driving on driver subjective ratings of trust in the system. A driving simulator study was implemented with elderly and and non-elderly participants (sixteen each). Two driving scenes such that an automated driving vehicle met another vehicle intending to change lane in front of the automated vehicle and intending to join driving lane in front of the automated vehicle at the Interchange were prepared in this study. Three types of control strategies were assumed as the system response to another vehicle. First is that the automated driving system gives way to another vehicle, second is that the automated driving system does not give way to another vehicle and last is that the automated driving system askes drivers to take overt the driving control (RtI: Request to Intervene). Differences in driver behaviour were also assessed when drivers were required to take driving control over from the automated driving system. The results demonstrated that trust of non-elderly drivers was more impaired when the automated driving system did not gave way for another vehicle, compared to elderly drivers. Non-elderly drivers gave way for another vehicle faster and more often by their own driving compared to elderly drivers. Relationships between driver's workload for using the automated driving and trust would be discussed in this paper.