Public transportation expenditures consumed 6 percent of the average household's transporation budget in 1997, divided between intracity and intercity travel (22 percent and 78 percent of total public transportation expenditures, respectively). Intracity transportation modes include mass transit, taxi and limousine service, and school bus. Intercity transportation modes include air, bus, train, and ship. This report highlights public transportation expenditures by consumer units in 1997, classified by income quintiles and by regions