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The topic of social interaction, and its relationships to travel and transportation, is rapidly gaining interest in the transportation community. Going beyond the study of intra-household interactions, a more general view of social contact is sought that can help to explain the motivation for, and characteristics of, travel behavior. The study of inter-household interactions, as well as interpersonal interaction in settings other than the household, represents a promising way to improve our understanding of different aspects of travel behavior, including modal choice, work and non-work travel, the decision to telework, the planning and execution of activities, and locational decisions. The papers in this special issue represent a selection of research presented at the international workshop Frontiers in Transportation II: Social Interactions, held October 13–16, 2007 in Amsterdam, the Netherlands. 1 This activity, endorsed by the …