Pedestrian Carelessness toward Traffic Environment Due to External Human–Machine Interfaces of Automated Vehicles

To determine whether external human–machine interfaces (eHMIs) make pedestrians careless toward the traffic environment, we examined the following four hypotheses: H1, the pedestrian decides to cross earlier after seeing a yielding message on an eHMI; H2, the pedestrian perceives safety after seeing a yielding message on an eHMI; H3, the pedestrian’s confirming behavior before crossing is suppressed after the pedestrian sees a yielding message on an eHMI; H4, miscommunication between pedestrians and automatic vehicles can be caused by yielding messages on an eHMI.