“…It is then important to examine various effective ways to reduce private automobile use and encourage sustainable transport behavior. Previous research has used mainly the Theory of Planned Behavior (TPB) to predict the intention to reduce car use and sustainable transportation behavior; some studies have investigated other factors, such as personal norm and car use habit, to explain the intention or behavior [ 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ]. In particular, Heath and Gifford [ 11 ] tested the predictive utility of TPB in a sample of Canadian university students.…”