Abstract The transition to sustainable mobility requires more than infrastructural investment; it demands a profound understanding of the psychosocial mechanisms driving travel behaviour. This thesis operationalises the Attitude–Behaviour Gap within the specific context of the Amedeo Avogadro Technical Institute in Turin, adopting a Living Lab approach. By integrating the General Ecological Behaviour (GEB) scale with Social Cognitive Theory (SCogT) constructs derived from the Triadic Reciprocal Determinism framework and objective spatial accessibility metrics, the study isolates the barriers preventing pro-environmental intentions from translating into action. The empirical analysis identifies a clear differentiation within the student population. While a minority belongs to the Gap Group, individuals with high environmental disposition who nonetheless rely on private motorised transport, a substantial share falls into the Potential Shift category, using sustainable modes despite low pro-environmental motivation.