“…For AR displays, most researchers have simulated AR HUDs by presenting AR graphics directly within driving scene (with no physical AR display; Caird et al, 2008;Kim and Dey, 2009;Plavšic et al, 2009;Charissis and Papanastasiou, 2010;Medenica et al, 2011;Dijksterhuis et al, 2012;Olaverri-Monreal et al, 2012;Kim et al, 2013Kim et al, , 2016Saffarian et al, 2013;Schall et al, 2013;Wai-Tat et al, 2013;Lorenz et al, 2014;Politis et al, 2014;Sharfi and Shinar, 2014), while some installed in-house prototypes (Tonnis and Klinker, 2006;Langlois, 2013;Tran et al, 2013), aftermarket c, or head-worn displays inside driving simulators (Sawyer et al, 2014;Tippey et al, 2017). Generally speaking, from our experience, integrating graphics directly into the driving scene (via computer graphics or video) does not afford the same accommodative and/or cognitive switching (Gabbard et al, 2019) that a separate AR display does; an important component for research that wishes to faithfully examine the effects of AR HUDs on driver's visual attention.…”