Considering Habit in Research on Travel Mode Choice: A Literature Review with a Two-Level Methodology

This study used sources from selected databases to provide an overview of the role of habit in choosing a mode of travel. The articles were selected from two levels. The first included selected studies that considered the psychological aspects of travel mode choice and travel mode change. These created the context for the issues of mode choice and the change of travel mode. The second level was narrower and included studies that were directly focused on the role of habit in travel mode choice or that took the role of habit into account. These studies were used as the core of the review. Subsequently, the topic of habit and travel mode choice was divided into four fields: the theoretical definition of the concept of habit, both in general and in the context of travel mode choice; the theoretical bases of the selected studies; follow-up strategies for transport-mode change; and the measurements and methods used in the field. The Theory of Planned Behaviour (TPB) is the most often used theory for explaining the travel mode choice. Other approaches include the Norm Activation Model and the Value Belief Norm Theory. The aim for other approaches is usually to trigger conscious choice processes, but most reaearchers believe that travel mode choices are automatic and habitual when made in a stable context. The Comprehensive Action Determination Model is a promising theoretical integration that may be used in future research. It integrates assumptions of the TPB, Norm Activation Model, theoretical habit conception, and ipsative behaviour theory in order to build on habitual processes, intention processes, situation effects, and personal and social norms. As habit seems to have the most important role in the choice of travel modes and the possible changes, it should also be considered for mode-choice models in the automation era.