*3.6. Survey*

The participants completed two surveys: one at the beginning of the experiment and another at the end. The purpose of the pre-test survey was to obtain driver characteristics and the emotional and physical states. The survey contains questions about the level of stress, fatigue and sadness that the driver feels before the driving test. The participant should respond using a Likert scale. A Likert scale is a psychometric scale used in educational and social sciences research that employs questionnaires [92]. The Likert scale is composed of a set of statements (items). Participants are asked to show their level of agreemen<sup>t</sup> (from strongly disagree to strongly agree) with the given statement (items) on a metric scale. In our case, the scale is between 1 and 5, where 1 means that he or she does not su ffer from that symptom or emotion and 5 that he or she develops it to a high degree.

The post-test survey was focused on ascertaining the emotional and physical states after completing the driving task. The objective was to check if the driving task had emotionally a ffected the driver. As previously mentioned, it comprises queries about the level of stress, fatigue and sadness that the driver feels but in this case after the driving test. This survey also includes questions about the degree of realism of the simulator, the satisfaction level of the drivers with their driving performance and the environmental conditions (temperature, noise and humidity). These questions will allow us to check if the subjective opinion of the participant corresponds to the data gathered by the sensors and if the simulator is realistic enough to infer that in a real environment, we would obtain similar results.
