The regularities in travel time and money expenditures of household and travelers in urban areas are examined. Data from both developed and developing countries are analyzed and compared. The data analyses suggest that travel time and money expenditures display regularities that are associated with such factors as households socioeconomic characteristics, transport system supply, and urban structure. Special attention is given to the possible segmentation of households for travel demand analyses, as inferred from the travel time and money expenditures. The analyses suggest that travel time and money expenditures can be conveniently summarized as travel time and money budgets and that their relatively stable functions can be transferred between cities and over time in a country. Use of these travel budgets in travel forecasting and transport policy planning is discussed, and suggestions are made for future research into travel time and money expenditures. (Author)
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