“…The current body of work can be divided into research that had a broad look at the social acceptability of new wearable technologies [27,28], or the use of headsets in public [11,22,30,46,72], including more focused work on gaze [3] and gestures [26,32], or discussion of the user and observer roles [4,69,72]. Some authors specifically looked at travelling contexts [5,11,15,65,74,75], but focused on limited application areas, such as entertainment [74], or had a more theoretical approach to the work, lacking in situ studies [15,65] and showed a need for further research in real-world environments [75]. Finally, the researchers that deployed their experiments in situ [11] were limited to public spaces, such as a university café, which are not representative of passenger experiences whilst travelling.…”