Abstract
In this study, we focused on interactions between a driver and SAE Level 2 driving automation systems (driving support systems), and investigated how the systems affect driving behavior. Whereas driving automation systems are expected to improve traffic safety, if the systems would potentially lead to driver distraction, it could cause new traffic risk. In our study, we let 10 participants drive virtual expressway environment on a driving simulator with and without a SAE Level 2 driving automation system. As a result of analysis, we have found out that the frequency of eye movements is significantly increased and subjective assessment of driver's attention towards surrounding hazards significantly decreased while using the system even when the driver did not feel drowsy. Considering the findings that drivers tend to look aside while using the system, the results indicate the risk that the driving automation system could cause drivers' distraction even when drivers do not feel drowsy.
