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In previous research, we conducted a small-scale experiment in Switzerland to study the effect of a temporary use of public transportation by habitual car drivers on their commute satisfaction and mode switching. This paper reports findings from a similar experiment conducted at the Massachusetts Institute of Technology (MIT) with a larger sample, focusing on mode switching differences between the two experiments. Whereas none of the Swiss participants switched, about 30% of MIT participants switched to public transportation after the intervention (or treatment). An analysis of the underlying reasons for these differences is presented, including individual socio-demographic factors, travel attributes and institutional transportation policies, experiment context, social influences, and psychological variables. The individual and behavioral variables are compared between those who switched to public transportation …