Travel behaviours have shown considerable resistance to change, but substantial change is needed because reduced emissions cannot be secured from technical innovation alone. Our focus is on a new way to engage with, and ultimately influence, travel behaviours. Instead of appealing to emission reduction (which can feel removed from our everyday experiences), we appeal to people’s wish to improve their own subjective well-being (SWB). Drawing on the behavioural economics concept of experienced utility (EU) and the psychology of health behaviour change, we combine these perspectives with expertise from mobile computing, creative technologies, mathematics and user-centred design to explore an innovative solution to understanding and potentially influencing travel behaviour.