Table 3.
Post-drive questionnaire divided in groups with their corresponding references.
| Group | Questions | Reference source | Original questions |
|---|---|---|---|
| G4—Experience with automation | The system's performance matches my expectations of an automated vehicle | Modified after Forster et al. (2017) | The system's performance matches my expectations of a CAD system |
| G5—Trust in automation | I trust the system to safely operate in the next drive. | Forster et al. (2017) | I trust the system to safely operate in the next drive |
| I am convinced of the system. | Forster et al. (2017) | I am convinced of the system | |
| The system is safe. | Modified after Waytz et al. (2014) | The system provides safety | |
| The system is dangerous. | Forster et al. (2017) | The system is dangerous | |
| The system is trustworthy. | Forster et al. (2017) | The system is trustworthy. | |
| The system is working accurately. | Modified after Forster et al. (2017) | I suppose the system works accurately | |
| G6—Trust process | I am familiar with the system. | Jian et al. (2000) | I am familiar with the system. |
| I trust the system to warn me in time before a take-over situation. | New item | ||
| The system is deceptive. | Jian et al. (2000) | The system is deceptive. | |
| I trust the system during system maneuvers. | Modified after Forster et al. (2017) | I trust the system's mode of operation during system maneuvers | |
| G7—Trust purpose | I feel fine handing over control to the system. | Forster et al. (2017) | I feel fine handing over control to the system |
| The system is a reliable partner. | Forster et al. (2017) (modified by Jian et al., 2000) | The system is a reliable partner | |
| The vehicle seems to be intelligent. | Forster et al. (2017) | The vehicle seems to be intelligent. | |
| G8—HMI driving task | I would prefer more communication from the system. | Modified after Nordhoff et al. (2023) | The information conveyed by the interface is unambiguous & The information conveyed by the interface is clear to me |
| My driving tasks during a take-over were clear. | Modified after Forster et al. (2017) | Driving task responsibility was explicitly clarified | |
| The information provided by the user interface is sufficient. | Modified after Nordhoff et al. (2023) | The information conveyed by the interface is clear to me | |
| The user interface clearly conveyed if the automation was working or not. | Modified after Nordhoff et al. (2023) | The information conveyed by the interface is recognizable | |
| G9—HMI feeling | The user interface is calming. | Modified after Verberne et al. (2012) | To what extent would using this ACC system evoke the feeling calmness? |
| The user interface is comprehensible. | Modified after Nordhoff et al. (2018) | The user interface would not take long to learn | |
| The user interface is complex. | Modified after Nordhoff et al. (2018) | The user interface would not take long to learn | |
| The user interface is predictable. | Modified after Nordhoff et al. (2018) | Is easy to understand | |
| G10—Ambient color urgency Perception | How did the color of the ambient lighting make you feel? [scale from 1 (calming) to 5 (urging)] | New item | – |
Participants could rate every question from 1 (strongly disagree) to 5 (strongly agree).