Characteristics of r's car/ ownership: private, employer or lease / who pays costs / making use of other vehicles: bicycle, public transport/ purposes of car use, frequency, distances, travelling times, exposure to traffic-jams/ car pooling/ r's standards of driving p1346b: r's practical possibilities to reduce his use of car and his sensitivity to possible measures by the government to reduce car use: higher road taxes, better, cheaper public transport, closing of inner towns, higher fuel prices, toll on motorways, lower maximum speed etc.

Background variables: basic characteristics / residence / household characteristics / place of work / occupation / employment / education / consumption of durables