“In terms of the percentage of all daily trips (all purposes) that are catered for by private transport U.S., ANZ, and Canadian cities (79-89 percent) head the list. Their wealthier counterparts in Europe and Asia have only 50 percent and 42 percent, respectively, of all trips by private transport, while in lower income cities, it is 36 percent (Asian cities), with the exception of Middle Eastern cities (56 percent). “(Kenworthy, J., 2007)

Explain what determines the preference for private transport and how those factors interact with the level of income in the regions mentioned in the excerpt above?