To study the effects of road pricing ( rekening rijden ) on traffic streams. First stage: Departure and arrival time, origin, destination, purpose / public transport as alternative: negative aspects of public transport / flexibility of working hours / car costs payed by company. Second stage: For each respondent / 2 sets of alternative travels have been generated by computer: various combinations with differences in times of departure and arrival, costs and mean of conveyance, ranking of these cards in order of preference. Background variables: basic characteristics/ residence/ household characteristics/ occupation/employment/ income/capital assets/ education/ consumption of durables