Subjective Acceptability of Canceling a Driver Steering Intervention during Emergency Manoeuvre in Level 3 Automated Vehicles

Abstract

The regulation on Automated Lane Keeping Systems (UN R157) requires that in case of an event in which the vehicle is at imminent collision risk, the system is to perform an Emergency Manoeuvre (EM) for the purpose of avoiding or mitigating a collision. In this study, a DS (Driving Simulator) experiment was conducted to investigate the subjective evaluation when the override by the driver's steering during EM braking control was cancelled. Forty-two people participated in the experiment. Experimental conditions were with and without adjacent vehicles when EM was activated. Regarding the degree of satisfaction with the system, including the cancellation of override, under the condition “with” an adjacent vehicle, 4 out of 8 (50.0%) responded from "slightly satisfied" to "satisfied", and under the condition “without” an adjacent vehicle, 7 out of 10 people (70.0%) responded from “dissatisfied” to “very dissatisfied”. Various opinions were obtained on the suppression of driver intervention, and these are presented below.