The household plays an important role in behavior change in many lifestyle areas. Various intervention programshave been implemented in order to change travel behavior and it is well known that travel behavior is influenced bythese, and that the household plays an important role. Less research has gone into understanding the reasons forsuch behavior changes. With the aim of understanding more about household influences and triggers of travelbehavior change, two intervention studies were conducted which included free travel passes on public transport. InStudy 1 (n=108) questionnaires were sent out by e-mail to investigate whether or not household members’ influenceanother member participating in a voluntary change program, and to thus identify influential triggers. In Study 2(n=20), interviews were conducted to identify and understand influential triggers in travel behavior change. The resultsshow, in line with previous research, that household members influence each other’s behavior. In addition toinstrumental triggers, affective triggers were also identified as being of key importance. Although the householdenabled travel behavior change, it was predominantly perceived to hinder travel behavior change.