Monitoring the effects of tariff raises in public transport within the framework of the general mobility developments. This description comprises the fourth wave of the longitudinal mobility survey ( longitudinaal verplaatsingsonderzoek ). Subsequent waves will be stored under different study numbers. The survey monitors ( changes in ) transportational behaviour, mobility and effects of raising tariffs for public transportation. Data were gathered by questionnaire. The diaries, describing all mobility during one week, were not use in this wave. Detailed data were gathered on: family composition, financial situation of family, working hours, commuting, travelling allowances, car, train, use of reduced fare cards for public transport. This wave was held for administrative purposes only and in order to keep panel-attrition down. It contains far less information than the normal waves. It consists of four files, containing family-data( A=SPSS-file, C=raw data ) and family member-data ( B=SPSS-file, D=raw data ) respectively. Background variables: basic characteristics/ residence/ household characteristics/ occupation/employment/ income/capital assets/ education/ consumption of durables