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This master thesis analyzes the influence of psychological barriers of consumers from Germany, Sweden, and Iran for using sustainable transportation modes. Climate change has started to change the way people travel. Yet prior research has shown that consumers from all over the world lack consistency between their behavioral intention and their actual behavior. In the case of traveling, this means that a significant number of consumers intends to use sustainable transportation modes, but fails to use them in the end. The reasons for this so-called intention-behavior gap in consumers' minds have been researched successfully and frequently in the past two decades. The novelty of this present thesis is the international comparison of travelers from three different countries and the explicit focus on voluntary travel. The according research questions are:

RQ 1:  To what extent is there a gap between the intention and behavior of leisure travelers          regarding choosing sustainable transportation vehicles?

RQ 2:  Which group of consumers (inclined abstainers or disinclined actors^[1]) plays the bigger      role in creating this gap?

RQ 3:  What are the determinants and barriers of using more sustainable transportation     vehicles in leisure transportation?

RQ 4:  How is the sustainable behavior of leisure travelers in Sweden, Germany, and Iran            different?

To answer the research questions, an online survey in Swedish (n₁ = 130), German (n₂ = 128), and Persian (n₃ = 127) language was carried out ( ∑ n = 385) in April 2020 with a convenience sampling method and analyzed in May 2020. The results show that there is a slightly positive intention-behavior gap in the Swedish sample and a slightly negative intention-behavior gap in the Iranian sample. In the German sample, no significant intention-behavior gap has been found. Moreover, a higher level of environmental attitude, a higher level of environmental knowledge, a higher level of perceived effectiveness (of the consumers' own actions), and a higher level of social norms increases the intention of leisure travelers in Sweden, Germany, and Iran to use sustainable vehicles for leisure traveling - both for short and for long trips. The impact of perceived value and perceived price of sustainable transportation modes, as well as the impact of consumers' sustainable lifestyle on the on the travel intention are not supported in all three countries. Additionally, distance between origin and destination has been found to moderate the impact of determinants on intention. The moderating role of distance also varies in different countries.

^[1] See the literature review chapter for an explanation