TRAVEL BEHAVIOR RELATED DETERMINANTS OF MENTAL MAP QUALITY: AN EMPIRICAL STUDY Caspar Chorus, Harry Timmermans The study of mental maps has been central to the field of Human Geography and Environmental Psychology for many years. Recently the specific interrelations between the quality of these mental maps and travel behavior (people’s choices for travel modes and routes, and their frequency of travel) have also gained increasing attention in transportation research. This latter stream of research has provided much supportive evidence, both theoretical and empirical, for the claim that in order to properly understand peoples’ mental maps, one needs to understand their travel behavior and vice versa. However, the role of mental maps as a determinant of travel choice behavior has received more attention than the role of travel choice behavior as a determinant of mental maps. This difference in attention especially holds for empirical research and is somewhat surprising in light of the multitude of theoretical suggestions that travel behavior - be it in the form of, for example, route choice, destination choice, or travel information acquisition - plays a potentially very important role in helping shape travelers’ mental maps. This paper aims to contribute to the small body of literature on the impact of travel behavior in general, and travel mode choice-behavior in specific, on the quality of people’s mental maps. Firstly, we investigate to what extent travel mode-choice behavior influences the quality and shape of travelers’ mental maps. Specifically, we investigate whether travelers using ‘passive modes’ (defined as modes that do not require the traveler to navigate his or her way through the city themselves, such as transit) develop mental maps of inferior quality compared to those developed by travelers using ‘more active modes’ such as the car. As a second contribution, besides an assessment of how socio-demographic factors in combination with travel (mode-choice) behavior affect the revealed, or objectively measurable, quality of people’s mental maps, we also study their impact on stated, or perceived, quality of people’s mental maps. In addition, we relate travelers’ stated evaluation of their mental maps with their revealed quality. The result is a study that builds on and contributes to recent empirical literature describing the impact of travel behavior on the quality of people’s mental maps. A number of results are obtained. For example, our analyses suggest that indeed, travelling by means of active modes, requiring active navigation of the traveler, leads to higher quality of mental maps. We find strong effects for both the car and bicycle modes (relative to using the more passive bus-mode). Furthermore, there appears to be a rather strong correspondence between stated (or: perceived) and revealed (or: actual) quality of people’s cognitive constructions of urban space. This correspondence, which can be conceived as a measure of how well someone is able to assess his or her spatial knowledge, is particularly strong among women and non-residents of the study area.