“…Although it might have increased the value of the task if it would be able to detect cognitive distraction as well, the fact that mainly visual distraction affected CTT performance underscores the similarities between the CTT and the operational level of driving. When comparing visual and cognitive distraction, Kaber, Liang, Zhang, Rogers, and Gangakhedkar (2012) found that the presence of visual distraction led to larger steering errors. Accordingly, Liang and Lee (2010) reported that visual distraction went with abrupt steering control, large lane variance, and delayed reactions to lead vehicle brake events, results they did not find for cognitive distraction.…”