Abstract
Objective: The purpose of this study is to find out how the angle of seat backrest and the number of hands in use affect the takeover reaction time, driving readiness, and driving situation awareness when performing NDRT (Non-Driving Related Task) in a conditional autonomous vehicle.<BR><BR>Background: Driver of an autonomous vehicle of level 3 or higher is freed from the duty of controlling and monitoring the vehicle. As a result, the driver can perform various NDRTs. When performing NDRT, the angle of the seat back that the driver wants to pose may be different. In a previous study, it was mentioned that, when the angle of seat backrest is reclined to the maximum, the takeover is affected. However, it is not known with certainty what effect the change of the seat back angle has on the takeover. A previous study found that some type of NDRTs, which restricted the driver
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