This chapter presents the results of analyses where the sample of respondents has been divided into subgroups. The purpose of these analyses is to investigate whether the influences of urban structural characteristics on travel are different among different population groups. Previous studies, including Jørgensen (1992) and Næss and Jensen (2004), indicate that the amount of travel and the modal split are influenced by urban structural characteristics to a lesser extent among certain population groups than among the population as a whole. From theoretical considerations, influence on travel behaviour from the location of the residence relative to workplace concentrations could be expected to be different among workforce participants, compared to non-participants of the workforce. The distance from the dwelling to central Copenhagen (where there is a high concentration of office jobs) might also exert a different influence on travel behaviour among clerks than among employees of manufacturing industries. Differences in the influence of urban structure on travel might also possibly exist, depending on whether or not there are children in the household, and whether a household with children includes one or two adult persons.