This article presents the results of a panel survey designed to determine season travel ticket use in the metropolitan area of Valencia. Spain. The procedure consisted of surveying a randomly selected panel of season ticket users within a given study area in spring 2002,fall2002, and late winter 2002-2003. A total of143 respondents were recruited by phone calls from existing users of season tickets. Each respondent was asked to complete a four~day trip diary in each survey. Only 53 panelists gave a valid response in the second survey wave. Of the panelists who participated in the three waves, 31 provided valid responses. Results revealed a higher increase of season ticket use among those 45 years and older, followed by male users, travelers with more than one car at home, and those with car availability.